Is it possible to make a hue color scale which can then be converted to RGB?

I have a brain atlas image that is set with hue color values between 0-1 that are then converted to RGB. Different regions of the brain have different hue values based on the inputs of the areas being selected. What I now want to do is creat a hue color scale that goes from cold colors like dark blue to hot read, sort of like a heat map. Would you know how I could do this?

[Alexandar]

Or is there a way I can manipulate the hue color wheel to be displayed as a heat map? I tried doing that but it includes colors like pink, purple, or green which are colors that I don’t want. I just want colors that go from “hot to cold” if that makes sense?

Answer 1

[Kevin Holly]

Have you looked at Colormaps? If so, have you tried adjusting the limits with clim, formerly known as caxis (renamed in R2022a).

If you have a .nii file, you can use the app attached as an example.