Query or Change Palette Colors (OSC 4)

Query or change the color in the palette at index n depending on the value of c.

If c is given as the single character ?, then the terminal will respond with the color specification of the color at index n. If c is a valid color, then the palette color is changed to it.

Pairs of n and c can be provided multiple times, separated with a semicolon (;). The terminal may reply with multiple sequences when multiple queries are made in one request.

Note

The terminal need not return the color exactly as it was specified.

When a color at a given index is changed, the terminal is allowed to convert the color into its internal representation, then reply in a different format when the same color is queried.

When n is between 0 and 255, the normal 256-color palette is used. When n is above 255, however, they instead map to special colors, with 256 mapping to the first special color (bold), 257 the second (underline), etc. This makes it behave equivalently to OSC 5 with the index subtracted by 256.