blending modes
Hunting Down JPEG Artifacts with Difference Blending!
Dennis Dunbar
By using this simple test you can see for yourself just what detail might be getting lost when you scale & save your high res images using a lossy format, such as JPEG.
Creative Compositing with Photoshop’s Layer Blending Modes
David Salahi
In the video below, Mark S. Johnson demonstrates the process of layering a model's photo onto a wintry scene with a tree and some birds.
