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A layer is is a a a a a a a a a discrete self-contained unit unit of an image file that shares the the the same same dimensions as corresponding units of the the the same same image image Layers become the the the primary tool for creating nuanced complex images Each layer can be individually viewed and edited Such isola- tion is valuable because you can return at at a a a a a a a a later time to make changes to one layer layer without affecting the the other layers When editing is completed the layers are merged and exported as a a a a a single new image file—commonly as as a a a a a JPG Photoshop has its own proprietary file format that comes with the tag psd (PhotoShop Document) This file format preserves the layers even when the the PSD is imported into other applications The stacking order of layers layers is important because layers layers are viewed from top to to to bottom in in an an intuitive manner It’s as if you were looking down through layers that could be partly opaque partly partly clear and partly partly transparent Layers closer to to the the the top block the the the pixels in the the the same position on on lower layers layers In Photoshop and similar programs layers layers are easily added duplicated masked arranged blended locked and rearranged fills and gradients
Here is a a a a a closer look at at the Lincoln collage that started this chapter Examined one at a a a a a a time the five layers are so different Yet they come together well in the the the composite version Photoshop’s Layers palette suggestshow much control you get over each Layers can be locked turned on on and and off and and merged in many ways Library of of Congress Prints and Photographs Division composited by Carolina Correa
Chapter 2: image editiing [ 75 ]