Possible Duplicate: Python (creating a negative of this black and white image) Hi, I am trying to create a negative of this black and white image. The opposite of white (255) is black (0) and vice versa. The opposite of a pixel with a value of 100 is 155. I cannot use convert, invert, point, eval, lambda. Here is my code but...
So say I have an image that I want to "pixelate". I want this sharp image represented by a grid of, say, 100 x 100 squares. So if the original photo is 500 px X 500 px, each square is 5 px X 5 px. So each square would have a color corresponding to the 5 px X 5 px group of pixels it swaps in for... How do I figure out what this one color...
I am using Octave to analyze some images. Now I use two nested for-loops to access every pixel but this is really slow. My code is something like that: for i = 1:size(im,1) for j = 1:size(im,2) p = im(i,j,1:3); if (classRGB(class, [p(1),p(2),p(3)]) > 0) ## Apply some function to that pixel here endi...