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The "preview" is actually the main image data from the version of the file format that was used before Photoshop supported layers. It remains there, I guess, s
by user-the-name 6y ago
The "preview" is actually the main image data from the version of the file format that was used before Photoshop supported layers.
It remains there, I guess, so that you can display the image even if you don't support loading and compositing layers.