If you’ve ever tried to hide or doctor a photo using photo editing software, then you don’t want to read this breakdown of how your photoshop handiwork can be discovered. It’s quite amazing that all this data is leaked out; I’m surprised there aren’t more exposés of doctored photos from online sources.
Although the dress appears to have a random noise pattern, there is actually one area where there is a well-defined pattern: her chest. Between her breast the dots form a well-organized “stretch” pattern. The modification also appears in a demosaic analysis as a diamond-shape distortion in the middle of her chest, and in the 2nd principal component as a minor color variation. Digital enhancements usually appear in multiple image analysis tests, and this appears in min/max, PCA, and demosaic analysis, among other tests.