different color for different region of image

Hi I have an image, I wonder how to assign different color for different region in the image? For example how can I choose one colormap for blue rectangle and one colormap for green rectangle and the rest of figure uses different colormap.

Answer 1

[Image Analyst]

That's precisely what my demo does. It's attached below the image. I have a freehand region version (also attached) if you're interested.

[chess]

So these demos will take care of the rectangular part what about the remaining part how to make it different customized color, for example I was thinking of starting with whatever colormap I like then change only the colormap of these rectangular parts. But I do not know is there any better method

[Image Analyst]

Look at the code:

% Make them color images.
% Use the jet colormap
rgbCroppedImage =uint8(255 * ind2rgb(croppedImage, jet));

I used jet, but you are free to use your own custom colormap.

[chess]

Another problem I have is when I do it for one part using imfreehand how can I hold an image to do it for another region because if I redo the script again it will overwrite the previous one?

[Image Analyst]

Well don't run that part of the script again - the part that reads in the original image. Just run the part that asks for the region and colorizes it. Put it in a for or while loop if you want.