Despite its historical importance, using Photoshop CS3 today is difficult. Adobe has since transitioned to the Creative Cloud subscription model. Reviving my old PS CS3 on a newer OS - Adobe Community

Layers are a fundamental concept in Photoshop CS3. They enable you to work on multiple elements of an image independently, making it easier to edit and manipulate complex compositions. You can create new layers, merge existing ones, and adjust layer properties, such as opacity and blending modes.

Adobe Photoshop CS3 wasn't just a minor update; it brought several "killer features" that revolutionized professional workflows:

To complement the new selection tools, Refine Edge gave designers much-needed control over tricky selections like hair or fur, allowing for smoother, more natural composites.

: A revolutionary brush-based selection tool that used color and texture data to "guess" what the user wanted to select, drastically reducing manual masking time.

Photoshop CS3 offers a wide range of image editing techniques, including: