I am using mathematica to processing digtal image. sampledata is 256*256.
Now I want to operate pic, such as show only the the left-upper part. Can I use something like
Show[pic,...]? If so, what parameters should I use? I knew this is very simple by manipulating the index of the matrix if using Matlab, but I have no idea for mathematica. Thanks a lot! I am just a beginner.