Layers made the work of many a photographer and designer easier, and although Photoshop was not the first image editing program to introduce layers, it most definetly made them a commonplace feature for any graphic software package worth its salt.

Despite now being over 15 years old, some users just haven't let go. Back in 2008 - and not for retro-appeal, just because the illustrator loved version 3.0 so much.

Two years after 3.0 arrived, its big brother--codenamed Big Electric Cat--hit shelves. Version 4.0 introduced adjustment layers and macros (known as Actions). The addition of Actions allowed for the automation of generic tasks, adding again to the time-saving appeal of the Photoshop product.

Photoshop 4.0 also saw several interface changes, bringing it more in line with other Adobe products.