Pixel Information/Manipulation

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Pixel Information/Manipulation

almalin
Hello, I am new in this forum and in ImageJ. I have to make one image program, and have to start with the beginning.
I need to have the pixel information. Let's say, my image is 100x100 pixels, and RGB. Is there a way that I can manipulate each pixel? compare each red value with it's neighbors?
Is there a way to print this values to a txt file or xls?
Thanks in advanced.
BR,
Alma