10% of 1 megapixels divided by 24 is 4166. So, even if you only consider the least significant bit of one of the three subpixels in 10% of the image you still h

10% of 1 megapixels divided by 24 is 4166. So, even if you only consider the least significant bit of one of the three subpixels in 10% of the image you still have 16 times more information than what you can represent in a SHA256 hash from a measly 1 megapixel image. I think it is valid to question how you could reduce the search space enough to be more beneficial than brute forcing SHA256.