Yes there are duplicates, thats not the problem, my Issue is that they are under one Column which makes it hard to delete the duplicates.
"Are selection rectangles/squares?" - What I did is get a 16x14 Picture and then export it as a csv. file.
The Picture itself is made out of squares* This is the Picture I used ->
I understand the numbers, one RGB code = One Pixel, one Column has 16RGB Codes x 14 rows, but its is just harder to work with it if the 16 RGB Codes are in the same Column (A1,A2...etc.)