num2jet.m

Returns RGB used in figure output of "image(data)" with default jet colormap selected.

I needed to create rgb jpg images of heatmaps that had the same dimensions as my input data. If a heatmap is created using the image function and then saved as a jpgeg, the dimensions of the resulting jpeg no longer correspond to the input dimensions of the data. This function returns a matrix of uint8 data with the same x and y dimensions as the data you input. The z dimension data correspond to RGB values. The output is suitable for conversion to jpg, tiff etc. using imwrite.