First, a necessary heads-up:
There is no legitimate, legal "100% free" version of Photoshop CS3 from Adobe. Adobe has never released CS3 for free. Any website offering "Photoshop CS3 free full version" is likely distributing pirated software, which can contain malware, spyware, or be illegal to download. Adobe officially discontinued CS3 long ago and does not provide free activation.
Q: I found a "CS3 Portable 100MB" download. Is it safe? A: Portable cracks are among the most dangerous. They often bypass antivirus detection and inject malware directly into your system registry. Avoid at all costs.
Prepping for Flash: CS3 featured tight integration with Adobe Flash CS3, allowing users to import organized PSD layers directly into web projects.
Print Preparation: Users can manage color spaces (like Adobe RGB 1998) and convert profiles via the Edit > Convert to Profile menu to ensure color accuracy on professional printers.
Stacking and Masking: You can stack multiple filters on a single layer and toggle them on or off individually. Each Smart Filter also comes with its own Filter Mask, letting you paint away the effect from specific parts of the image.