How to Open Raw files in Photoshop Non-Destructively 

Learn how to optimise your editing of Raw files within Photoshop and retain access to all the Raw file data. Details below...
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A Raw file dragged into Photoshop will, by default, open in the Camera Raw editor. When choosing Open, any changes that were made are burned into the image created in Photoshop. However, if Open As Object is chosen within the Camera Raw editor, a Smart Object containing a copy of the original Raw file is created within Photoshop. Double clicking on the Smart Object thumbnail within the Layers panel reopens the Camera Raw editor at any future point. Opening as a Smart Object allows for non-destructive edits to be made on original Raw file data.