Re: Explicit rgb colors [was Re: historysize]

[<mi...@ph...>]

>> But at some point, the Postscript terminal has to decide for itself how
>> many palette entries it wants. From my reading of the output file, the
>> colours of the dots are determined by a single "gray" value, which has
>> only four digits of precision -- clearly not enough to handle 24 bit
>> colour.

This scheme with 4 digits is enough for continous pm3d maps. It should
stay as is, as for large maps, every byte written to the datafile counts
(nb of points)-times.

An easy fix would be to extend the precision if "set palette maxcolors" is
larger than 1e4.

> So maybe we need to consider one or both of the following changes to
> post.trm
>
> 1) Only some plot styles should use this "optimization".  Color assignment
>    for points, say, could be done by post.trm itself just as it is done by
>    gd.trm
>
> 2) The run-time/print-time optimization choice could be toggled by a
>    suboption to "set term post", but would continue to apply equally to
>    all plot elements.

Or some new call like term->set_palette(be truecolor).
Or term->set_trucolor(rgb_or_cmyk_, r, g, b, k) to bypass the current
set_palette+set_color mechanism.

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PM