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TERMS: note COLORTERM in linux console

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nick black 2020-07-13 23:26:46 -04:00
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TERMS.md
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@ -14,7 +14,7 @@ The following have been established on a Debian Unstable workstation.
| Terminal | Recommended environment | Notes |
| -------- | ------ | ----- |
| Linux console | `TERM=linux` | 8 (512 glyph fonts) or 16 (256 glyph fonts) colors max. |
| Linux console | `TERM=linux` | 8 (512 glyph fonts) or 16 (256 glyph fonts) colors max, but RGB values are downsampled to a 256-index palette (see below). |
| FBterm | `TERM=fbterm` | 256 colors, no RGB color. |
| kmscon | `TERM=xterm-256color` | No RGB color AFAICT, nor any distinct terminfo entry. |
| XTerm | `TERM=xterm-256color` `COLORTERM=24bit` | Must configure with `--enable-direct-color`. `TERM=xterm-direct` seems to have the undesirable effect of mapping low RGB values to a palette; I don't yet understand this well. The problem is not seen with the specified configuration. |
@ -64,6 +64,12 @@ mapping keyboard scancodes to elements of the character set. These properties
are per-virtual console, not common to all of them. These limitations are not
typically present on framebuffer consoles.
Exporting `COLORTERM=24bit` and emitting RGB escapes to the Linux console
**does** work, though the RGB values provided are downsampled to a 256-slot
palette. Backgrounds don't seem to have the same degree of flexibility in this
situation as do foregrounds. The output is better, but not as much better as
one might expect. More research is necessary here.
The following more-or-less standard tools exist:
* `showconsolefont`: show the console font
* `setfont`: load console font