Re: pm3dcolors demo broken

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

>> set terminal png transparent nocrop enhanced size 450,320 font "arial,8"
>> set output 'pm3dcolors.1.png'
>> load 'C:\Programs\gp510-64\demo\pm3dcolors.dem'
>> set output
>>
>> <http://gnuplot.10905.n7.nabble.com/file/n19585/pm3dcolors.png>
>>
>> This is the same as on the web site.
>>
>> Is this a png terminal bug?
>
> Possibly, but I don't think so.  It may be that libgd is limited in
> terms of colors.  In term/gd.trm is stated:
>
>   /* TODO: how to recover from a multiplot with two colour pm3d maps?
>      They must use the same palette! Or palette size must be
>      restricted to certain number of colours---a new user's option
>   */

Old time ago, "gd" was a library for gif files only, so limited to 256 
colours, and thus the reason for adding "set palette maxcolors" in gnuplot 
(very old "new user's option").

I think there might have been an error message like "no more available colours".

Do you think that it is worth to add such a message, saying also "use option 
truecolor", and removing (I think mine) old TODO?

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PM