Diffusion Models: Images From Noise

A square image 512 dots wide and 512 dots tall is 786,432 numbers, because each dot of color needs three numbers, one each for its red, green, and blue parts. In the simplest design, an image generator begins with 786,432 random numbers. No picture is hidden inside them. Over many rounds, the model changes each number a little until an image appears.

Many well-known image generators work this way. Suppose an online store uses one to create banner images. A seller types "a red bicycle leaning on a brick wall at sunset" and clicks Generate