Fast way to map pixel values in a image to different values

I have a image (.tif) in which each pixel takes a value from numbers in keySet. I have to map them to a different value and following is what I did.

    keySet = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 254, 255};
    %converting to 1-based indexing and creating a map.    
    valueSet = {1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 2, 2, 4, 5};
    tranformMap = containers.Map(keySet,valueSet);

    image = readFile(filePath)  %reads a .tif file.
    for key = keys(tranformMap)
        processedImage(image == key{1}) = tranformMap(key{1});
    end

Although it works, I was wondering if there was a faster way to do it.

Answer 1

[Image Analyst]

Yes there is. You can use the "intlut()" function.