ImageApplyIndexed

ImageApplyIndexed[f,image] applies the function f to the list of channel values for each pixel in image, giving the row and column index of each pixel as a second argument to f.

ImageApplyIndexed[f,{image1,image2,…}] applies f to the sequence of corresponding pixel values taken from each imagei, giving the corresponding row and column index of pixels as the last argument to f.

Examples

Apply a function that uses pixel position:

ImageApplyIndexed[#2[[1]]/100 &, Image[RandomReal[1, {100, 100}]]]

Please visit the official Wolfram Language Reference for more details.