MATLAB: Change color of a image according to pixel value. PLEASE HELP.

colormap

I want to change gray image to RGB according to pixel values. I mean, the pixel which are having higher values will be changed to red color and pixel

which are having lower values will be changed to bluish color. Mainly I am doing a project in which I want to change a thermal gray image to a image having temperature related image like hotter part having red color and colder part will be having blue color. PLEASE HELP ME. THANKS IN ADVANCE.

Best Answer

Do something like

rgbImage = ind2rgb(grayImage, jet(256));

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MATLAB: Put color to a gray image

gray_as_RGB = repmat(YourGrayImage, [1 1 3]);

now gray_as_RGB is the RGB equivalent of the grayscale image and you can write color information into it.

MATLAB: Assigning color to gray image

I'd just use colormap and not mess with contours unless you know what you're doing and what you want. To pseudocolor a grayscale image an leave it as grayscale but display it as colored:

imshow(grayImage);
colormap(jet(256));
colorbar;

To convert a grayscale image into a true color RGB image and display the RGB image instead of the pseudocolored image:

rgbImage = ind2rgb(grayImage, jet(256));
imshow(rgbImage);

You don't use color bars with RGB images.

Best Answer

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MATLAB: Put color to a gray image

MATLAB: Assigning color to gray image

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