scalar2colormap

Grayscale image into monopolar or bipolar RGBA image with colorbar.

Function scalar2colormap is designed to transform 2D scalar image into a monopolar or bipolar RGBA image. Colormaps can be defined independently for negative, zero, and positive scalar values. Colormap can be imposed on a background image with a chosen transparency and cropped with an additional mask image. Colormaps are linear by default but function supports for non-linear mapping as well to further enhance polar differences. Optional output gives object handles for figure, axes, images, and colorbar for final tuning (titles, fonts, labels etc.) of the image.