num2jet.m

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

Description

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.

• MATLAB release: MATLAB 7.8 (R2009a)

[Oliver Woodford]

For a more general solution (i.e. that works for any colormap) you can use MATLAB's ind2rgb, or real2rgb (found here: http://www.mathworks.com/matlabcentral/fileexchange/23342).

[David Godlove]

For a more general solution which retains the original simplicity, see num2colormap.m. This function has been made obsolete by num2colormap.m.