To find out how much scratch disk space you'll need, multiply your document size (5 MB) by the number of image-wide changes in the History palette (10) and you should, in this example, come up with 50 MB (5 x 10 = 50). In Step One, I counted 10 image-wide adjustments. (If you don't see the document size, click on the right-facing triangle on the status bar and choose Show>Document Sizes.) In this example, it's approximately 5 MB. Next, look at the document size in the status bar of your document window. If you find yourself waiting too long when switching between Photoshop and another application, try choosing Edit>Purge>Clipboard to trash any data on the clipboard and make switching faster. That said, take a look at the History palette for a typical photo that you may be working on and count how many image-wide adjustments you've made. Think of it this way: if you've got a 1-MB file and you apply the Smart Sharpen filter to the entire photo you'll need 2 MB of scratch disk space. In Photoshop CS2, you can use the states in your History palette to help you determine how much scratch disk space you need.Įverything you do in Photoshop that applies a change to the entire image creates a full copy of the image at its original size to store for the History States in the History palette. However, that method no longer provides an accurate estimate of how much scratch disk Photoshop needs. To avoid this, in the past people used a formula that consisted of taking 35 times the size of your average image and specifying that amount as your scratch disk. If your scratch disk becomes full, then Photoshop must start to swap out data from your computer's RAM and this can slow things down dramatically or cause them to come to a screeching halt with an out of memory or scratch disk space error message. Photoshop CS2 introduced some changes in the way it manages this memory on your computer. ![]() The hard drive Photoshop writes this information to is called the scratch disk. If Photoshop runs out of its available RAM, it uses your hard drive space to store this information. When you open and work on images, Photoshop first uses your computer's RAM to store information about the image you're currently working on.
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