Should I keep the embedded full-size JPEG preview in DNG files?

Asked 12/31/2010

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My Pentax K-x writes DNG files that contain two embedded JPEG previews: a small preview (640×480) and a full-size preview (4288×2848). The full-size preview increases the DNG file size by about 10%.

Is it worth keeping the full-size embedded preview, or should I remove it to save space? What practical advantage does the full-size JPEG preview provide compared with the smaller one?

file-management workflow jpeg-preview dng raw

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

15y ago

2 Answers

The preview image tends to be used as a thumbnail in the computer, it can be used to quickly glance at a bunch of files and figure out which is the one you want. It's up to you, but I recommend keeping the preview image. It doesn't need to be full sized, but the small image should be worth it.

Originally by user2692. Source · Licensed CC BY-SA 4.0

user2692

15y ago

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Embedded JPEG previews in DNG files are mainly there for fast viewing and thumbnailing without fully rendering the raw data. They help your computer or photo software quickly show images so you can browse and identify files more easily.

Keeping at least the small preview is usually worthwhile for that reason. A full-size preview can make larger previews or quick full-screen viewing faster, but it also increases file size. If saving space matters more than faster browsing, removing the full-size preview is reasonable. If convenience matters more, keep it.

In short: the preview’s advantage is speed and easier browsing, not improved raw image quality. The small preview is generally the most useful to keep; the full-size preview is optional depending on your workflow and storage priorities.

Should I keep the embedded full-size JPEG preview in DNG files?

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