Bleach is a luminance vs saturation tool that lets you shape the saturation of your image based on brightness levels. It’s a powerful but often overlooked adjustment that’s especially useful for creating filmic looks—where shadows tend to carry more saturation and highlights appear more bleached out, hence the name. This tool is also great for creating a form of faux-contrast; by saturating shadows and desaturating highlights, you can introduce a sense of depth and richness in the dark areas while giving the highlights a clean, airy feel—boosting perceived contrast without actually altering the luminance curve.