hmmm yeah I guess it even not a problem if it was 16 BIT Grayscale, conversion is relative easily, though Im not so sure considering the random factor/other intermediate processing that might turn the reverse engineering into a havoc, but if its about RGB images, I dont know, the complexity and relationship between R, G, and B channel is not something could be standardized easily, it might be case by case and unique, And dont forget about image stretching consideration