Mapcolor: Easily apply mulitple colormaps on the same figure

Ever wish you could use multiple colormaps on a single figure? Now you can. Given an array, mapcolor.m applies a colormap of your choice, returning a new array of the same size that contains explicit RGB triplets. You can then display your data in color, using built-in plotting functions, without relying on the figure's colormap setting.

Also included:
mapcolorbar.m mimics colorbar.m when you're using mapcolor.
colorlabel.m quickly applies labels to Colorbars and MapColorbars.
redblue.m is a colormap from red, through white, to blue--useful for data centered on zero.