Hi Pierre,
Could you please elaborate a bit on this
> usecase. I was thinking, naively, that when plotting a grayscale image,
> one would simply used a gray colormap.
>
Using a colormap with hue and saturation gives you better contrast than
pure grayscale. For natural images, that is, photographs of human-scale
objects, indeed grayscale is a good choice, because that is how we are used
to looking at those images. But for looking at physical quantities, for
example, using a colormap with hue and saturation as well as lightness is
useful. Here are some examples:
http://www.gnuplotting.org/color-maps-from-colorbrewer/
https://www.mrao.cam.ac.uk/~dag/CUBEHELIX/
See also a "boundary probability map" for a natural image here (panel B,
top right):
http://www.frontiersin.org/files/Articles/74212/fninf-08-00034-r2/image_m/fninf-08-00034-g001.jpg
Having the colormap makes it easier to place the intermediate levels of the
probability map.
Again, restricting the lightness range for these maps would be problematic,
to say the least.
Juan.
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