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by Dylan16807 1963 days ago
Is the preview the full resolution? That seems very overkill.
2 comments
mockery 1963 days ago
Perhaps, but it's quite convenient for any software that wants to ingest PSD files without the (nigh-intractable) challenge of reimplementing the entirety of Photoshop's parser and rendering systems!
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user-the-name 1962 days 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.

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