Layers in Photoshop

Adobe Photoshop over the years

Originally written on a Macintosh Plus by a doctoral candidate named Thomas Knoll, the computer program that came to be known as Adobe Photoshop officially celebrates its 20th birthday this month. And what a 20 years its been!

The first versions of Photoshop were only available on the Macintosh. This was one of the things that cemented Apple’s reputation as the leader in the field of desktop publishing.

Often hailed as the single most important aspect of the program’s development, which version of Photoshop was the first to include support for layers?

Think you know the answer? Post a response in the comments — we’ll post the answer tomorrow.