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Many users ask me how to copy or duplicate images before they edit them-they are convinced by Photos’ sleight of hand and believe they need to preserve their original before making any adjustments. This is the main point of confusion for people. While this is clearly correct, hiding the original reinforces the perception that the original has been modified. Outside of editing mode, Photos hides the original photo from view, instead showing the full-size JPEG or smaller thumbnails at every point in the application.
If you want to continue editing the image at a later date, Photos reloads both the original and the edit instructions and then combines them to display the adjusted image. The edit instructions are stored in the photo library’s database, along with other information about the image. The smaller thumbnails are stored in “container” files that hold multiple thumbnails at once. The full-size JPEG is an individual file on disk.
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You cannot rely on the Info pane in the Mac version of Photos to tell you the file type you are editing because it always shows you the file type of the original.) After the edit is completed, this is what is stored on disk: (Photos makes JPEGs for all file types, including RAWs and Apple’s new HEIC files. Photos saves the edit instructions in a location separate from the original file and generates a full-size JPEG (and smaller thumbnail images) that contain the results of the edits. While extremely useful, this non-destructive model can be confusing to users because it clashes with their expectations based on other applications. From your standpoint, the image appears to be modified, but the original file remains untouched. The application may automatically save the edit instructions, or it may wait for you to hit Done or choose Save. The application applies edits to an in-memory copy of the original to produce a real-time preview of the adjusted image. In contrast, most photo-editing applications work non-destructively and never modify the original photo. Some image-editing applications also modify image files directly, notably Adobe Photoshop and Apple’s Preview. For example, when you choose Save in Microsoft Word, it saves your changes directly to the document’s file, replacing the previous version of the file in the process. Most applications directly modify your documents. If you are unfamiliar with RAW, you may wish to read a separate article of mine that discusses the benefits of RAW as well as touching on Apple’s new HEIF image format. In this article, I will often use RAW Power as an example, though other Photos extensions work similarly. Now I’m on my own, developing a Photos extension called RAW Power that uses the same RAW engine underlying Photos and Aperture. To give you some background, I was the lead developer for Aperture, and I later led the team that developed the editing engine for the Mac version of Photos.
Then I’ll go into detail about how non-destructive editing in Photos works with RAW image files, Photos extensions, and more. To shed light on the situation, I’ll first explain how non-destructive editing works in photo applications in general, using Photos as an example. That said, non-destructive editing brings with it some confusion, particularly for those working with RAW images or using Photos extensions to do the editing. One of the near-magical features of Photos, and iPhoto before it, is the way it allows you to edit a photo with the assurance that those edits are non-destructive-you can always revert to the original version. #1620: OS updates, AssistiveTouch for iOS shortcut palette, Photos album sharing bug.
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