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I asked a few questions on here and I found the majority of users use:
http://collab.mathsoft.com/~Mathcad2000
They should figure out a way to merge that into here or something.
In Reply to David Haigh:
I guess there's not much interest in Mathcad, however the hot line helped me. Here's how you do it.
Read the original image
R:=READ_IMAGE("camera.bmp")
rows(R)=256 cols(R)=256
insert the R pic so you can figure out what you want to keep
Crop the image like this