strange colormap behaviour with postscript printing

[Ben Abbott]

On Jan 17, 2009, at 6:51 PM, Ethan A Merritt wrote:

> On Saturday 17 January 2009, Ben Abbott wrote:
>>>
>>>
>>> The reason is that you are using a custom color map (COLOR map)
>>> which you
>>> try to print to a monochrome postscript printer. Therefore gnuplot
>>> ignores
>>> your specific color map and uses the default gray mapping instead
>>> ('set palette gray positive|negative gamma _gamma_').
>
> I think that gnuplot/postscript should honor a custom colormap
> even if it is in monochrome mode, for the same reason that it
> honors RGB colors even though it is in monochrome mode.
> "set term post mono"  should set a default behaviour, but not
> limit what the user can do via explicit commands.
>
> So IMHO this really can be considered a gnuplot bug.

For the case of a monochrome custom colormap, I share Ethan's opinion.

For the case of a RGB colormap, it might be a missing feature, but as  
converted from RGB to gray is a simple procedure I see no reason not  
support all custom colormaps when using the monochrome postscript  
terminal.

In any event, I have submitted a bug report.

	https://sourceforge.net/tracker2/?func=detail&aid=2516634&group_id=2055&atid=102055

Ben