One of the biggest features: you could apply filters (like Gaussian Blur or Unsharp Mask) as —meaning you could adjust or remove them later without re-opening the file.
Some of the key features of Photoshop CS3 include: Adobe Photoshop CS3 Full Version
A major upgrade over the Magic Wand, this tool used edge-detection technology to make complex selections faster. One of the biggest features: you could apply
: Used for moving layers and selections [9, 10]. [Locked] Photoshop CS3 Activation [CS3 is dead] -
[Locked] Photoshop CS3 Activation [CS3 is dead] - Adobe Community
Photoshop CS3 represented a maturation of Adobe’s Creative Suite era, bringing workflow refinements and tools that influenced later releases. Its introduction of Quick Selection and Smart Filters helped shift many artists toward non-destructive editing workflows. CS3 also marked deeper integration with Bridge and other Creative Suite apps, improving cross-application asset management.
If you simply want the CS3 experience for free, legally, consider (which Adobe officially released for free in 2013 due to server shutdowns). CS2 is nearly identical to CS3 but lacks a few refinements.