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xenoid
xenoid
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What can have happened is the original picture had a large thumbnail (the thumbnail is actually a JPEG-in-the-JPEG in the metadata) and that it was scaled down but with the metadata left in(*) , so now the thumbnail is bigger than the original. You can extract metadata with some EXIF-handling utilities, for instance with exiftool

exiftool -b -PreviewImage -w _preview.jpg <your image>

or

exiftool -b -preview:all -w _preview.jpg <your image>

Note that the preview is of moderate quality (on my DSLR, the preview are full-size, quality 80).

(*) this also happens if the photo was shot in "raw" form, and the metadata left in by demosaicing apps. This is even more likely if the image thumbnail is full-size (thumbnails in JPEGs are usually smaller images than the original)

What can have happened is the original picture had a large thumbnail (the thumbnail is actually a JPEG-in-the-JPEG in the metadata) and that it was scaled down but with the metadata left in(*) , so now the thumbnail is bigger than the original. You can extract metadata with some EXIF-handling utilities, for instance with exiftool

exiftool -b -PreviewImage -w _preview.jpg <your image>

Note that the preview is of moderate quality (on my DSLR, the preview are full-size, quality 80).

(*) this also happens if the photo was shot in "raw" form, and the metadata left in by demosaicing apps. This is even more likely if the image thumbnail is full-size (thumbnails in JPEGs are usually smaller images than the original)

What can have happened is the original picture had a large thumbnail (the thumbnail is actually a JPEG-in-the-JPEG in the metadata) and that it was scaled down but with the metadata left in(*) , so now the thumbnail is bigger than the original. You can extract metadata with some EXIF-handling utilities, for instance with exiftool

exiftool -b -PreviewImage -w _preview.jpg <your image>

or

exiftool -b -preview:all -w _preview.jpg <your image>

Note that the preview is of moderate quality (on my DSLR, the preview are full-size, quality 80).

(*) this also happens if the photo was shot in "raw" form, and the metadata left in by demosaicing apps. This is even more likely if the image thumbnail is full-size (thumbnails in JPEGs are usually smaller images than the original)

Source Link
xenoid
xenoid
  • 22k
  • 1
  • 29
  • 65

What can have happened is the original picture had a large thumbnail (the thumbnail is actually a JPEG-in-the-JPEG in the metadata) and that it was scaled down but with the metadata left in(*) , so now the thumbnail is bigger than the original. You can extract metadata with some EXIF-handling utilities, for instance with exiftool

exiftool -b -PreviewImage -w _preview.jpg <your image>

Note that the preview is of moderate quality (on my DSLR, the preview are full-size, quality 80).

(*) this also happens if the photo was shot in "raw" form, and the metadata left in by demosaicing apps. This is even more likely if the image thumbnail is full-size (thumbnails in JPEGs are usually smaller images than the original)