Re: strange colormap behaviour with postscript printing

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

I have patch gnuplot 4.2 and cvs so that it keeps the custom colour map 
intact when printing to "postscript monochrome".

Now I propose that Octave is passing the colormap() through a "rgb2gray()" 
function before printing to any monochromatic device (probably only "-dps" 
and "-deps") so that the image will look the same whatever the drawing 
backend is selected.


> >I think that Octave could pass the custom colormap() through a "rgb2gray()"
> >function before printing to any monochromatic device (not just monochromatic
> >postscript). Then the plots
> > print('mono.ps', '-dps')
> > print('color.ps', '-dpsc')
> >will be same as in Matlab.
> 
> Unfortunately, 'mono.ps' and 'color.ps' inverted images (using the example
> below which accompanyied your patch).
> 
> 	a=1./hilb(42);
> 	colormap(flipud(gray));
> 	imagesc(a); colorbar
> 	print('mono.ps', '-dps');
> 	print('color.ps', '-dpsc');

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PM