Add checks for true colour support in terminal (visual only)
This commit is contained in:
Edward Litherland-Smith
parent
3fe142b8ca
commit
f07b34e790
100
true_colour_tests/24-bit-color.sh
Executable file
100
true_colour_tests/24-bit-color.sh
Executable file
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@ -0,0 +1,100 @@
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#!/bin/bash
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# This file was originally taken from iterm2 https://github.com/gnachman/iTerm2/blob/master/tests/24-bit-color.sh
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#
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# This file echoes a bunch of 24-bit color codes
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# to the terminal to demonstrate its functionality.
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# The foreground escape sequence is ^[38;2;<r>;<g>;<b>m
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# The background escape sequence is ^[48;2;<r>;<g>;<b>m
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# <r> <g> <b> range from 0 to 255 inclusive.
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# The escape sequence ^[0m returns output to default
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setBackgroundColor()
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{
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#printf '\x1bPtmux;\x1b\x1b[48;2;%s;%s;%sm' $1 $2 $3
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printf '\x1b[48;2;%s;%s;%sm' $1 $2 $3
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}
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resetOutput()
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{
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echo -en "\x1b[0m\n"
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}
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# Gives a color $1/255 % along HSV
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# Who knows what happens when $1 is outside 0-255
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# Echoes "$red $green $blue" where
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# $red $green and $blue are integers
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# ranging between 0 and 255 inclusive
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rainbowColor()
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{
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let h=$1/43
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let f=$1-43*$h
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let t=$f*255/43
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let q=255-t
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if [ $h -eq 0 ]
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then
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echo "255 $t 0"
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elif [ $h -eq 1 ]
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then
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echo "$q 255 0"
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elif [ $h -eq 2 ]
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then
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echo "0 255 $t"
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elif [ $h -eq 3 ]
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then
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echo "0 $q 255"
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elif [ $h -eq 4 ]
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then
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echo "$t 0 255"
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elif [ $h -eq 5 ]
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then
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echo "255 0 $q"
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else
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# execution should never reach here
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echo "0 0 0"
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fi
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}
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for i in `seq 0 127`; do
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setBackgroundColor $i 0 0
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echo -en " "
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done
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resetOutput
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for i in `seq 255 -1 128`; do
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setBackgroundColor $i 0 0
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echo -en " "
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done
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resetOutput
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for i in `seq 0 127`; do
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setBackgroundColor 0 $i 0
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echo -n " "
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done
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resetOutput
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for i in `seq 255 -1 128`; do
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setBackgroundColor 0 $i 0
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echo -n " "
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done
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resetOutput
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for i in `seq 0 127`; do
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setBackgroundColor 0 0 $i
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echo -n " "
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done
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resetOutput
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for i in `seq 255 -1 128`; do
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setBackgroundColor 0 0 $i
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echo -n " "
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done
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resetOutput
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for i in `seq 0 127`; do
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setBackgroundColor `rainbowColor $i`
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echo -n " "
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done
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resetOutput
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for i in `seq 255 -1 128`; do
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setBackgroundColor `rainbowColor $i`
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echo -n " "
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done
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resetOutput
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362
true_colour_tests/TrueColour.md
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362
true_colour_tests/TrueColour.md
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# Terminal Colors
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There exists common confusion about terminal colors. This is what we have right now:
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- Plain ASCII
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- ANSI escape codes: 16 color codes with bold/italic and background
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- 256 color palette: 216 colors + 16 ANSI + 24 gray (colors are 24-bit)
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- 24-bit true color: "888" colors (aka 16 milion)
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```bash
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printf "\x1b[${bg};2;${red};${green};${blue}m\n"
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```
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The 256-color palette is configured at start and is a 666-cube of colors,
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each of them defined as a 24-bit (888 rgb) color.
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This means that current support can only display 256 different colors in the
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terminal while "true color" means that you can display 16 million different
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colors at the same time.
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Truecolor escape codes do not use a color palette. They just specify the
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color itself.
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This is a good test case:
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```bash
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printf "\x1b[38;2;255;100;0mTRUECOLOR\x1b[0m\n"
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```
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- or
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https://raw.githubusercontent.com/JohnMorales/dotfiles/master/colors/24-bit-color.sh
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- or http://github.com/robertknight/konsole/tree/master/tests/color-spaces.pl
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- or https://git.gnome.org/browse/vte/tree/perf/img.sh
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- or just run this:
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```sh
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awk 'BEGIN{
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s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
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for (colnum = 0; colnum<77; colnum++) {
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r = 255-(colnum*255/76);
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g = (colnum*510/76);
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b = (colnum*255/76);
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if (g>255) g = 510-g;
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printf "\033[48;2;%d;%d;%dm", r,g,b;
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printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
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printf "%s\033[0m", substr(s,colnum+1,1);
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}
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printf "\n";
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}'
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```
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Keep in mind that it is possible to use both ';' and ':' as Control Sequence
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Introducer delimiters.
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According to Wikipedia[1], this behavior is only supported by xterm and konsole.
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[1] https://en.wikipedia.org/wiki/ANSI_color
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Since
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[ncurses-6.0-20180121](http://lists.gnu.org/archive/html/bug-ncurses/2018-01/msg00045.html),
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terminfo began to support the 24-bit True Color capability under the name of
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"RGB". You need to use the "setaf" and "setab" commands to set the foreground
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and background respectively.
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# True Color Detection
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There will be no reliable way to detect the "RGB" flag until the new release of
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terminfo/ncurses. S-Lang author added a check for $COLORTERM containing either
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"truecolor" or "24bit" (case sensitive). In addition,
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[VTE](https://bugzilla.gnome.org/show_bug.cgi?id=754521),
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[Konsole](https://bugs.kde.org/show_bug.cgi?id=371919) and
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[iTerm2](https://gitlab.com/gnachman/iterm2/issues/5294) set this variable to
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"truecolor". It has been in VTE for a while and but is relatively new, being
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still git-only in Konsole and iTerm2).
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This is obviously not a reliable method, and is not forwarded via sudo, SSH etc.
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However, whenever it errs, it errs on the safe side. It does not advertise
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support when it is actually supported. App developers can freely choose to
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check for this same variable, or introduce their own method (e.g. an option in
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their config file). They should use whichever method best matches the overall
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design of their app. Checking $COLORTERM is recommended though since it will
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lead to a more seamless desktop experience where only one variable needs to be
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set. This would be system-wide so that the user would not need to set it
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separately for each app.
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## Querying The Terminal
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A more reliable method in an interactive program which can read terminal
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responses, and one that is transparent to things like sudo, SSH, etc.. is to
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simply try setting a truecolor value and then query the terminal to ask what
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color it currently has. If the response replies the same color that was set
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then it indicates truecolor is supported.
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```bash
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$ (echo -e '\e[48:2:1:2:3m\eP$qm\e\\' ; xxd)
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^[P1$r48:2:1:2:3m^[\
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00000000: 1b50 3124 7234 383a 323a 313a 323a 336d .P1$r48:2:1:2:3m
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```
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Here we ask to set the background color to `RGB(1,2,3)` - an unlikely default
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choice - and request the value that we just set. The response comes back that
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the request was understood (`1`), and that the color is indeed `48:2:1:2:3`.
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This tells us also that the terminal supports the colon delimiter. If instead,
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the terminal did not support truecolor we might see a response like
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```
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^[P1$r40m^[\
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00000000: 1b50 3124 7234 306d 1b5c 0a .P1$r40m.\.
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```
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This terminal replied the color is `40` - it has not accepted our request to
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set `48:2:1:2:3`.
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```
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^[P0$r^[\
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00000000: 1b50 3024 721b 5c0a .P0$r.\.
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```
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This terminal did not even understand the DECRQSS request - its response was
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`0$r`. We do not learn if it managed to set the color, but since it doesn't
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understand how to reply to our request it is unlikely to support truecolor
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either.
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# Terminals + True Color
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## Now **Supporting** True Color
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- [st](http://st.suckless.org/) (from suckless) [delimeter: semicolon] -
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http://lists.suckless.org/dev/1307/16688.html
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- [xst](https://github.com/gnotclub/xst/) - fork of st
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- [konsole](http://kde.org/applications/system/konsole/) [delimeter: colon,
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semicolon] - https://bugs.kde.org/show_bug.cgi?id=107487
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- [iTerm2](http://www.iterm2.com/) [delimeter: colon, semicolon] - since v3
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version
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- [Therm](https://github.com/trufae/Therm) [delimeter: colon, semicolon] - fork
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of iTerm2
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- [qterminal](https://github.com/lxqt/qterminal) [delimeter: semicolon] -
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https://github.com/qterminal/qterminal/issues/78
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- [alacritty](https://github.com/jwilm/alacritty) [delimeter: semicolon] -
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written in Rust
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- [kitty](https://github.com/kovidgoyal/kitty) [delimeter: colon,semicolon] -
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uses OpenGL
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- [cool-retro-term](https://github.com/Swordfish90/cool-retro-term) [delimeter:
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semicolon]
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- [mosh](https://mosh.org/) (Mobile SHell) [delimeter: semicolon] - since commit
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https://github.com/mobile-shell/mosh/commit/6cfa4aef598146cfbde7f7a4a83438c3769a2835
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- [pangoterm](http://www.leonerd.org.uk/code/pangoterm/) [delimeter:
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colon, semicolon]
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- [Termux](https://termux.com/) [delimeter: semicolon] - **Android platform**
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- [ConnectBot](https://connectbot.org/) - **Android platform** - since
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https://github.com/connectbot/connectbot/commit/3bcc75ccedaf2136b04c5932c81a5155f29dc3b5
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- [Black Screen](https://github.com/shockone/black-screen) [delimeter:
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semicolon] - crossplatform, HTML/CSS/JS-based
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- [hterm](https://chromium.googlesource.com/apps/libapps/+/master/hterm) -
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HTML/CSS/JS-based (ChromeOS)
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- [PuTTY](http://www.chiark.greenend.org.uk/~sgtatham/putty/) -
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[landed](https://git.tartarus.org/?p=simon/putty.git;a=commit;h=a4cbd3dfdb71d258e83bbf5b03a874c06d0b3106)
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in git (patched version [3] {xterm-like approximation to 256 colors} and [4]
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{real true colors} available) - **Windows platform**
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- [Tera Term](http://en.sourceforge.jp/projects/ttssh2/) [delimeter: colon,
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semicolon] - **Windows platform**
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- [ConEmu](https://github.com/Maximus5/ConEmu) [delimeter: semicolon] -
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**Windows platform**
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- [Windows
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Powershell](https://en.wikipedia.org/wiki/PowerShell#PowerShell_5.1)
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[delimeter: semicolon] - aka Powershell 5.x and below **Windows 10**
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- [Powershell Core](https://github.com/PowerShell/PowerShell) [delimeter:
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semicolon] aka Powershell 6+ **Windows 10**
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- [cmd.exe](https://en.wikipedia.org/wiki/Cmd.exe) [delimeter:
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semicolon] Builtin Windows shell that is mostly unchanged since DOS **Windows 10**
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- [FinalTerm](http://finalterm.org/) [delimeter: semicolon] -
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**[abandoned](http://worldwidemann.com/finally-terminated/)**, iTerm2
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[borrowing it's ideas and features](http://iterm2.com/shell_integration.html).
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- [MacTerm](https://github.com/kmgrant/macterm) [delimeter: semicolon] - **Mac
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OS X platform**
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- [mintty](https://mintty.github.io/) [delimeter: semicolon] **Cygwin and
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MSYS/MSYS2** since commit
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https://github.com/mintty/mintty/commit/43f0ed8a46c6549cb9a3ea27abc057b5abe13bdb
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(2.0.1 release) - **Windows platform**
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- [MobaXterm](http://mobaxterm.mobatek.net/) **Windows platform** - closed
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source (run `lscolors` to see a truecolor test)
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- [ZOC](https://www.emtec.com/zoc/index.html) **Windows/OS X platform** - closed
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source since
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[7.19.0 version](http://www.emtec.com/downloads/zoc/zoc_changes.txt)
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- [upterm](https://github.com/railsware/upterm) *Windows/Macos/Linux Electron* -
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A terminal emulator for the 21st century.
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- Windows 10 bash console, since
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[Windows Insiders build 14931](https://blogs.msdn.microsoft.com/commandline/2016/09/22/24-bit-color-in-the-windows-console/)
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- all [libvte](http://ftp.gnome.org/pub/GNOME/sources/vte/) based terminals
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(since 0.36 version) [delimeter: colon, semicolon] -
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https://bugzilla.gnome.org/show_bug.cgi?id=704449
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- **libvte**-based
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[Gnome Terminal](https://help.gnome.org/users/gnome-terminal/stable/)
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- **libvte**-based [sakura](http://www.pleyades.net/david/projects/sakura)
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- **libvte**-based
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[xfce4-terminal](http://docs.xfce.org/apps/terminal/start) - since
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[0.6.90](https://github.com/xfce-mirror/xfce4-terminal/releases/tag/xfce4-terminal-0.6.90)
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release, if compiled with GTK+3
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- **libvte**-based
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[Terminator](http://gnometerminator.blogspot.com/p/introduction.html) -
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since [1.90](https://launchpad.net/terminator/+announcement/14358) release
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- **libvte**-based [Tilix](https://github.com/gnunn1/tilix) - written in D.
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Similar user interface as for Terminator.
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- **libvte**-based [Lilyterm](http://lilyterm.luna.com.tw/) - since commit
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https://github.com/Tetralet/LilyTerm/commit/72536e7ba448ad9ef1126ce45fbde3a3407a271b
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- **libvte**-based [ROXTerm](http://roxterm.sourceforge.net/)
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- **libvte**-based [evilvte](http://www.calno.com/evilvte/) - no release yet,
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version from git https://github.com/caleb-/evilvte
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- **libvte**-based [Termit](https://github.com/nonstop/termit)
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- **libvte**-based [Termite](https://github.com/thestinger/termite)
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- **libvte**-based [Tilda](https://github.com/lanoxx/tilda)
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- **libvte**-based [tinyterm](https://code.google.com/p/tinyterm)
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- **libvte**-based
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[Pantheon Terminal](https://launchpad.net/pantheon-terminal)
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- **libvte**-based [lxterminal](http://sourceforge.net/projects/lxde) - with
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**--enable-gtk3** configure flag.
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- **libvte**-based [guake](http://guake-project.org/) - A top-down terminal for GNOME
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There are a bunch of libvte-based terminals for GTK2, so they are listed in the
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another section.
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Also, while this one is not a terminal, but a terminal replayer, it is
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still worth mentioning:
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- [asciinema](http://asciinema.org) player:
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https://github.com/asciinema/asciinema-player
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## Improper Support for True Color
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- [mlterm](http://mlterm.sourceforge.net) - built with **--with-gtk=3.0**
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configure flag. Approximates colors to 512 embedded palette
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(https://sourceforge.net/p/mlterm/bugs/74/)
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## Terminals that parse ANSI color sequences, but approximate them to 256 palette
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- xterm (but doing it wrong: "it uses nearest color in RGB color space,
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with a usual false assumption about orthogonal axes")
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- [urxvt aka rxvt-unicode](http://software.schmorp.de/pkg/rxvt-unicode.html) -
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since
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[Revision 1.570](http://cvs.schmorp.de/rxvt-unicode/src/command.C?revision=1.570&view=markup&sortby=log&sortdir=down)
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http://lists.schmorp.de/pipermail/rxvt-unicode/2016q2/002261.html (Note there
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is a restriction of colors count still)
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- linux console (since v3.16):
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https://github.com/torvalds/linux/commit/cec5b2a97a11ade56a701e83044d0a2a984c67b4
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Note about color differences:
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a) RGB axes are not orthogonal, so you cannot use
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sqrt(R^2+G^2+B^2) formula
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b) for color differences there is more correct (but
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much more complex)
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[CIEDE2000](http://en.wikipedia.org/wiki/Color_difference#CIEDE2000) formula
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(which may easily blow up performance if used blindly) [2].
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[2] https://github.com/neovim/neovim/issues/793#issuecomment-48106948
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## Terminal multiplexers
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- [tmux](http://tmux.github.io/) - starting from version 2.2 (support since
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[427b820...](https://github.com/tmux/tmux/commit/427b8204268af5548d09b830e101c59daa095df9))
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- [screen](http://git.savannah.gnu.org/cgit/screen.git/) - has support in
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'master' branch, need to be enabled (see 'truecolor' option)
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- [pymux](https://github.com/jonathanslenders/pymux) - tmux clone in pure Python
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(to enable truecolor run pymux with `--truecolor` option)
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- [dvtm](https://github.com/martanne/dvtm) - not yet supporting True Color
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https://github.com/martanne/dvtm/issues/10
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## **NOT Supporting** True Color
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- [Terminal.app](https://en.wikipedia.org/wiki/Terminal_(macOS)): Macos Terminal builtin
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- [Terminology](https://www.enlightenment.org/about-terminology)
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(Enlightenment) - https://phab.enlightenment.org/T746
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- [Hyper.app](https://hyper.is/) [delimeter: semicolon] - crossplatform,
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HTML/CSS/JS-based (Electron) https://github.com/zeit/hyper/issues/2294
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- [Cmder](https://cmder.net/): Portable console emulator for Windows,
|
||||
based on ConEmu.
|
||||
- [Terminus](https://github.com/Eugeny/terminus):
|
||||
highly configurable terminal emulator for Windows, macOS and Linux
|
||||
- [mrxvt](https://sourceforge.net/projects/materm) (looks abandoned) -
|
||||
https://sourceforge.net/p/materm/feature-requests/41/
|
||||
- [aterm](http://www.afterstep.org/aterm.php) (looks abandoned) -
|
||||
https://sourceforge.net/p/aterm/feature-requests/23/
|
||||
- [fbcon](https://www.kernel.org/doc/Documentation/fb/fbcon.txt) (from linux
|
||||
kernel) - https://bugzilla.kernel.org/show_bug.cgi?id=79551
|
||||
- FreeBSD console - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191652
|
||||
- [yaft](https://github.com/uobikiemukot/yaft) framebuffer terminal -
|
||||
https://github.com/uobikiemukot/yaft/issues/12
|
||||
- [KiTTY](http://www.9bis.net/kitty/) - **Windows platform**
|
||||
- [MTPuTTY](ttyplus.com) - **Windows platform**
|
||||
- [mRemoteNG](https://mremoteng.org/) - **Windows platform** -
|
||||
https://github.com/mRemoteNG/mRemoteNG/issues/717
|
||||
- [JuiceSSH](https://juicessh.com/) - **Adroid platform**, closed source
|
||||
- [Termius](https://www.termius.com/) - **Linux, Windows, OS X platforms**,
|
||||
closed source
|
||||
- [SmarTTY](http://smartty.sysprogs.com/) - **Windows platform** - closed source
|
||||
(sent them a request)
|
||||
- [Netsarang XShell](https://www.netsarang.com/products/xsh_overview.html) -
|
||||
closed source (sent them an email)
|
||||
- libvte and GTK2 - based:
|
||||
- **libvte**-based [GTKTerm2](http://gtkterm.feige.net/)
|
||||
- **libvte**-based [stjerm](https://github.com/stjerm/stjerm) (looks
|
||||
abandoned) - https://github.com/stjerm/stjerm/issues/39
|
||||
|
||||
# Console Programs + True Color
|
||||
|
||||
## Console Programs Supporting True Color
|
||||
|
||||
- [s-lang](http://lists.jedsoft.org/lists/slang-users/2015/0000020.html)
|
||||
library - (since pre2.3.1-35, for 64bit systems)
|
||||
- [ncurses](https://www.gnu.org/software/ncurses/) library - since 6.1 version
|
||||
- [Eternal Terminal](https://mistertea.github.io/EternalTCP/) - automatically
|
||||
reconnecting shell
|
||||
- [mc](http://www.midnight-commander.org) - since
|
||||
[682a5...](http://www.midnight-commander.org/changeset/682a5116edd20b8ba81743a1f7495c883b0ce644).
|
||||
See also [ticket #3724](http://www.midnight-commander.org/ticket/3724) for
|
||||
truecolor themes.
|
||||
- [irssi](https://github.com/irssi/irssi) - since
|
||||
[PR #48](https://github.com/irssi/irssi/pull/48)
|
||||
- [neovim](https://github.com/neovim/neovim) - since commit
|
||||
[8dd415e887923f99ab5daaeba9f0303e173dd1aa](https://github.com/neovim/neovim/commit/8dd415e887923f99ab5daaeba9f0303e173dd1aa);
|
||||
need to set
|
||||
[termguicolors](https://neovim.io/doc/user/options.html#%27termguicolors) to
|
||||
enable true color.
|
||||
- [vim](https://github.com/vim/vim) - (from 7.4.1770); need to set
|
||||
[termguicolors](https://github.com/vim/vim/blob/master/runtime/doc/version8.txt#L202)
|
||||
to enable true color.
|
||||
- [joe](https://sf.net/p/joe-editor) - (from
|
||||
[4.5](https://sourceforge.net/p/joe-editor/news/2017/09/joe-45-released/)
|
||||
version)
|
||||
- [emacs](https://www.gnu.org/software/emacs/) - since
|
||||
[26.1 release](https://lists.gnu.org/archive/html/emacs-devel/2018-05/msg00765.html)
|
||||
- [micro editor](https://micro-editor.github.io/)
|
||||
- [elinks](http://repo.or.cz/w/elinks.git) -
|
||||
[configure.in:1410](http://repo.or.cz/w/elinks.git/blob/HEAD:/configure.in#l1410)
|
||||
(./configure --enable-true-color)
|
||||
- [tcell](https://github.com/gdamore/tcell) library for Go language
|
||||
- [timg](https://github.com/hzeller/timg) - Terminal Image Viewer
|
||||
- [tv](https://github.com/daleroberts/tv) - tool to quickly view high-resolution
|
||||
multi-band imagery directly in terminal
|
||||
- [termimage](https://github.com/nabijaczleweli/termimage) - terminal image
|
||||
viewer
|
||||
- [explosion](https://github.com/Tenzer/explosion) - terminal image viewer
|
||||
- [ls-icons](https://github.com/sebastiencs/ls-icons) - fork of coreutils with
|
||||
`ls` program that supports icons
|
||||
- [mpv](https://github.com/mpv-player/mpv) - video player with support of
|
||||
console-only output (since 0.22 version)
|
||||
- [radare2](https://github.com/radare/radare2) - reverse engineering franework;
|
||||
since 0.9.6 version.
|
||||
|
||||
## Console Programs Not Supporting True Color
|
||||
|
||||
- mutt (email client) - http://dev.mutt.org/trac/ticket/3674
|
||||
- neomutt (email client) - https://github.com/neomutt/neomutt/issues/85
|
||||
- termbox library - https://github.com/nsf/termbox/issues/37
|
||||
- mcabber (jabber client) -
|
||||
https://bitbucket.org/McKael/mcabber-crew/issue/126/support-for-true-color-16-millions-colors
|
||||
- tig (git TUI) - https://github.com/jonas/tig/issues/227
|
||||
- cmus (music player) - https://github.com/cmus/cmus/issues/799
|
||||
- weechat (chat client) - https://github.com/weechat/weechat/issues/1364
|
||||
- scim (spreadsheet program) - https://github.com/andmarti1424/sc-im/issues/306
|
||||
- [gui.cs](https://github.com/migueldeicaza/gui.cs) Terminal UI toolkit for .NET
|
||||
(curses-like) - https://github.com/migueldeicaza/gui.cs/issues/48
|
||||
67
true_colour_tests/color-spaces.pl
Executable file
67
true_colour_tests/color-spaces.pl
Executable file
|
|
@ -0,0 +1,67 @@
|
|||
#!/usr/bin/perl
|
||||
# Author: Todd Larason <jtl@molehill.org>
|
||||
# $XFree86: xc/programs/xterm/vttests/256colors2.pl,v 1.1 1999/07/11 08:49:54 dawes Exp $
|
||||
|
||||
print "256 color mode\n\n";
|
||||
|
||||
# display back ground colors
|
||||
|
||||
for ($fgbg = 38; $fgbg <= 48; $fgbg +=10) {
|
||||
|
||||
# first the system ones:
|
||||
print "System colors:\n";
|
||||
for ($color = 0; $color < 8; $color++) {
|
||||
print "\x1b[${fgbg};5;${color}m::";
|
||||
}
|
||||
print "\x1b[0m\n";
|
||||
for ($color = 8; $color < 16; $color++) {
|
||||
print "\x1b[${fgbg};5;${color}m::";
|
||||
}
|
||||
print "\x1b[0m\n\n";
|
||||
|
||||
# now the color cube
|
||||
print "Color cube, 6x6x6:\n";
|
||||
for ($green = 0; $green < 6; $green++) {
|
||||
for ($red = 0; $red < 6; $red++) {
|
||||
for ($blue = 0; $blue < 6; $blue++) {
|
||||
$color = 16 + ($red * 36) + ($green * 6) + $blue;
|
||||
print "\x1b[${fgbg};5;${color}m::";
|
||||
}
|
||||
print "\x1b[0m ";
|
||||
}
|
||||
print "\n";
|
||||
}
|
||||
|
||||
# now the grayscale ramp
|
||||
print "Grayscale ramp:\n";
|
||||
for ($color = 232; $color < 256; $color++) {
|
||||
print "\x1b[${fgbg};5;${color}m::";
|
||||
}
|
||||
print "\x1b[0m\n\n";
|
||||
|
||||
}
|
||||
|
||||
print "Examples for the 3-byte color mode\n\n";
|
||||
|
||||
for ($fgbg = 38; $fgbg <= 48; $fgbg +=10) {
|
||||
|
||||
# now the color cube
|
||||
print "Color cube\n";
|
||||
for ($green = 0; $green < 256; $green+=51) {
|
||||
for ($red = 0; $red < 256; $red+=51) {
|
||||
for ($blue = 0; $blue < 256; $blue+=51) {
|
||||
print "\x1b[${fgbg};2;${red};${green};${blue}m::";
|
||||
}
|
||||
print "\x1b[0m ";
|
||||
}
|
||||
print "\n";
|
||||
}
|
||||
|
||||
# now the grayscale ramp
|
||||
print "Grayscale ramp:\n";
|
||||
for ($gray = 8; $gray < 256; $gray+=10) {
|
||||
print "\x1b[${fgbg};2;${gray};${gray};${gray}m::";
|
||||
}
|
||||
print "\x1b[0m\n\n";
|
||||
|
||||
}
|
||||
13
true_colour_tests/cscale.sh
Executable file
13
true_colour_tests/cscale.sh
Executable file
|
|
@ -0,0 +1,13 @@
|
|||
awk 'BEGIN{
|
||||
s="/\\/\\/\\/\\/\\"; s=s s s s s s s s;
|
||||
for (colnum = 0; colnum<77; colnum++) {
|
||||
r = 255-(colnum*255/76);
|
||||
g = (colnum*510/76);
|
||||
b = (colnum*255/76);
|
||||
if (g>255) g = 510-g;
|
||||
printf "\033[48;2;%d;%d;%dm", r,g,b;
|
||||
printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
|
||||
printf "%s\033[0m", substr(s,colnum+1,1);
|
||||
}
|
||||
printf "\n";
|
||||
}'
|
||||
Loading…
Reference in a new issue