Not exactly sure what you want, especially since we can't run your code because you didn't supply mag_fit. Perhaps this is what you might like: http://www.mathworks.com/matlabcentral/fileexchange/32273-im2html-m by Steve Eddins, the leader of the imaging group at the Mathworks
Essentially, you can colormap any value into an RGB color and that value is displayed in a box of that color with the RGB values imprinted over it.
By the way, did you know pcolor leaves off the last row and last column? Prove it yourself and run this pcolor(rand(3,3)); and see if you get a 3 by 3 image (you won't).
