Adjustments have been present in every version of Photoshop, increasing in number with each subsequent release:
|Replace Color||3.0 or earlier|
|Selective Color||3.0 or earlier|
|Auto Levels||3.0 or earlier|
|Desaturate||3.0 or earlier|
|Variations||3.0 or earlier|
Starting with Photoshop 4.0, Adjustment Layers became available, allowing adjustments to be non-destructive.
In Photoshop CS4, adjustments were finally given their own workspace panel.