Compositing and Blending – Exploring the math and intuition behind blend modes
2 days ago
- #web-development
- #css-blending
- #graphics
- Compositing combines HTML layers, determining final pixel colors using source and backdrop layers.
- Porter-Duff operators define 12 compositing methods based on pixel regions (Source Only, Backdrop Only, Both, Neither).
- Blending occurs in overlapping regions, using functions (blend modes) to modify source colors before compositing.
- Blend modes are categorized into Lighten, Darken, Contrast, Inversion, and Component types, each with specific visual effects.
- In CSS, use 'mix-blend-mode' or 'background-blend-mode' properties to apply blend modes to elements or backgrounds.
- Color spaces like sRGB and Display P3 can cause blending inconsistencies across browsers; use CSS color() for precision.
- Isolation via 'isolation: isolate' creates stacking contexts to control blending scope, avoiding unintended backdrop interactions.
- Practical applications include image text effects, duotone images, odd-shaped borders, and creative blob effects with filters.
- Real-world examples demonstrate blend modes for stylistic enhancements, such as overlaying text or unifying image aesthetics.