How does Photoshop or other image editing software change an images contrast? What does contrast mean when we process an image pixel by pixel? Or what does image contrast mean at all?
Here I created a very basic image to understand image contrast. This is a 10×10 pixels image that gets a 100% non-legacy contrast adjustment in Photoshop. The only change I saw was in gray colors that were lighter after applying the contrast.
Before and after contrast: