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Introduction

If you want to visually control an Adobe Photoshop CS document, then adjustment layers are the ultimate tool. The purpose of an adjustment layer is to visually illustrate how a specific adjustment, such as Hue & Saturation, is applied to the image. Since the adjustment is contained within a separate layer, the original image never changes. This gives you the ability to experiment with different settings, and since adjustment layers are saved with the document, you can save and return at a later time to make further adjustments.

Another advantage of adjustment layers is size. Adjustment layers do not increase the size of a Photoshop document. Most Photoshop layers are composed of pixels, so adding traditional layers to a document increases the size of the file. Since adjustment layers are a set of mathematical information, they do not increase the size of the file.


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