b0¶

Set color 0 to actual black. (This is done for both the LCh and RGB in-memory palettes, so that it does not matter whether "b0" is issued before or after a "rgb" command.)

bg¶

Emit a -bg parameter upon xterm, and use color 0.

ct¶

Print the 16-color table.

ct256¶

Print 256-color cubes and tables.

cxl¶

Print a contrast analysis of the palette based on brightness differences.

cxr¶

Print a contrast analysis of the palette based on radiosity differences. This is useful because even if two colors have the same/a similar brightness in the LCh colorspace, it is possible for (sufficiently capable) humans to distinguish such two colors.

debug¶

Turn on individual colorspace conversion reporting.

emit¶

Emit the palette as a line for an XDG theme file.

stat¶

Emit the LCh form of the palette to stdout (no particular formatting).

fg¶

Emit a -fg parameter upon xterm, and use color 7.

hueadd=h¶

Rotate colors using LCh space. (0 <= h < 360)

hueset=h¶

Set the hue of all colors using LCh space.

inv16¶

Perform color inversion the way Norton Icon Editor did it.

litadd=r¶

Change colors' brightness using LCh space.

litmul=r¶

Multiply colors' brightness using LCh space.

litset=r¶

Set colors' brightness using LCh space.

satadd=r¶

Change colors' saturation using LCh space.

satmul=r¶

Multiply colors' saturation using LCh space. In effect, with r<1, this causes a desaturation of colors; r=0 leads to gray.

satset=r¶

Set colors' saturation using LCh space.

hsltint=h,s,l¶

Map the (LCh) brightnesses onto a color line through the HSL cylinder that goes from black to the chosen color. Parameter ranges are (0 <= h < 360; 0 <= s < 1; 0 <= l <= 1). The result of the operation is stored in the RGB palette. When using s<=0.5, this produces a black-to-{color} ramp; when using s==1, this produces a black-to-{color}-to-white ramp.

hsltint produces a somewhat more contrasty result than manipulating hue and saturation in LCh. Compare:

• palcomp vgs lch satset=100 hueset=120 rgb emit
• palcomp vgs lch hsltint=90,1,0.5 emit

hsltint=#rrggbb[,l]¶

A different syntax for the hsltint operation. First, the RGB value for the tint color is converted to HSL. The so-computed L value can be overridden with the optional ,l suffix. Afterwards, behaves like hsltint=h,s,l.

lchtint=h,s,l¶

lchtint=#rrggbb[,l]¶

Replace the LCh hue and saturation by the base color given in HSL or RGB. The LCh L value is retained as-is.

loeq=b,g¶

Equalize (equal-space) the brightnesses of the palette's low-intensity colors plus darkgray. The b parameter (0 <= b <= g) specifies the mandatory offset from the darkest to 2nd darkest color — often this is black to blue. The g parameter (b <= g <= 100) specifies the lightness that gray is to use. If g is absent, uses g=8/9. If b is absent, uses b=1/9.

vga¶

Loads the standard VGA palette.

vgs¶

Loads a full-saturated VGA palette.

win¶

Loads the standard Windows palette.

xterm¶

Emit the RGB palette as xterm command line options. Use e.g. `xterm $(palcomp vga hueset=120 xterm)` to utilize.