Some colormaps that may be generally useful.
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gray.nrrd: Domain is from 0 to 1, producing a 3-vector of grays going linearly from [0,0,0] to [1,1,1]. -
spiral.nrrd: Domain is from 0 to 1, producing a 3-vector of RGB colors that go from [0,0,0] to [1,1,1], spiraling around to various hues along the way. The idea for this colormap was described by Colin Ware in an important paper. -
isobow.nrrd: Domain is from 0 to 1, producing a 3-vector of RGB colors that circle through hues (starting and ending at same blue). Face-based luminance matching was used to try to enforce isoluminance, but displays and viewers will vary.
The precise domain of the univariate colormaps extends half a sample below 0.0 and half a sample above 1.0, so that reconstruction with tent should safely fall between two samples for positions between 0 and 1.
You can make a picture of the univariate colormaps with unu, for example:
unu axinsert -i spiral.nrrd -a 2 -s 40 | unu quantize -b 8 -min 0 -max 1 -o spiral.png
More colormaps will be added as more example programs need them.