Well if we are talking just about the output of any diffusion model, being 512x512 pixels we get 262,144 pixels.

Each pixel can have a range of 0-255 for R,G, and B

256^3 = 16,777,217 (possible combinations for each pixel)

So then we get 16,777,217 ^ 262,144

This is an unimaginably large number, but it’s important to note that many of these images will appear to be exactly the same as one another due to our perception of color.