New version caused color change (ColorSlateGray)

[vlappa]

A new version of tcell after 2.7.4 changes the ColorSlateGray color, quite a bit. Not a improvement (subjective).

original || new color

[gdamore]

It may be a color fitting issue or it may be the terminal.

What terminal are you using?

The code is represented on true color using 0x708090, which has a little of blue to it. When I looked up the colors I get something in the middle of those.

This color is firmly in the region of true colors so we cannot have a theme color happening, unless your terminal isn't expressing true color in a way we can detect (in which case tcell will try to find a near match, but that might not be very close depending on what your terminal supports. Additionally terminal "color themes" can make this a bit messier as well, as the matching code can only match to a color it thinks is close based on the traditional XTerm 256 color scheme.

The best way to get actual correct colors should be to use a true color (24-bit) supporting terminal -- you can then set TERM to something like xterm-truecolor and you should have good results.

[vlappa]

I've tested this with several terminals in or outside tmux. st, lxterminal, ghostty.

Now when I update:

 github.com/gdamore/tcell/v2 v2.7.4
+       github.com/gdamore/tcell/v2 v2.8.1

The color changes for all the tested terminals.

[gdamore]

What value of $TERM are you using?

[gdamore]

I've added a demo (see #813 ) that you can use to display specific colors or color codes. You should be able to compare this agains the any version of tcell, although you'll have to copy it out of the tree if you want to use an earlier version.

Run it with go run _demos/showcolor.go (or '#hex' or an integer number for a palette index.)

[gdamore]

Specifically I've tested a few terminals, including ghostty, and the color displays matches the color displayed for slategrey when I look that color up on line ('#070909').