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Im currently adding different features to a very simple digital image processing program. It is coded using the unsafe methods.
This program only works with greyscale images.
My question is how do i apply masks to pixels?
Just multiply pix_vals by the mask and sum. So just add:
p[y * stride + x] = pix_val[0] * Gx[0] + … + pix_val[8] * Gx[8];
EDIT: Watch out for the corner cases though, you should really change your offsets to [-1, 0, 1] instead of [0, 1, 2] and handle the boundary conditions.