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I am looking for my adjustment layers on a image that fell out of my recent history. Is it hidden or possibly auto deleted? I can only see the last 12 unique images on my photoshop home screen, 24 tiles in total becuase it shows them next to each other, the raw and tiff. I tried opening the TIFF and the RAW in photoshop but they both open as new projects and I cannot access the adjusment layer from my original edit.
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You have just so many history stated for a document. They are used round robin, You effectively knock off the oldest history state when you do the your next step once you used all the history state you have set in your Preferences for your editing history. History states are expensive they consume a lot of machine resources If you keep a large numbers and have many document open you may start to run out of machine resources and Photoshop operation will go to pot. In your Photoshop's Preferences Performance section you can set up the 1000 history stated to keep for open documents. I would not recommend setting anywhere near that 1000 I think Adobe default setting is small like a dozen or so. If you use complex scripts that perform many steps. I would suggest you modify the scripts to suspend recording history so you can backed out what the Scripts did by just stepping back one history state and the script will not purge out all the steps in your documents history that you performed before using the script.