Why do Bridge and XnView show old thumbnails after cropping scanned JPEGs?
Asked 9/29/2023
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2 answers
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I scanned 4x6 prints as JPEGs from a full scanner bed, then cropped them in XnView MP. After cropping, Windows File Explorer and FastStone show the cropped images correctly, but Adobe Bridge and XnView MP still display the original uncropped versions in their grid/browser thumbnails.
Purging Bridge’s cache and rebuilding XnView thumbnails did not fix it. I also tried extracting an embedded thumbnail with ExifTool, but initially didn’t get a usable JPEG.
Could stale embedded thumbnails or preview images inside the JPEG files be causing Bridge and XnView to show the wrong preview? If so, how can I verify and fix that?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
2y ago
2 Answers
2
There are several locations that a preview image be in a file. Try using this exiftool command to extract all preview images from the file.
exiftool -a -b -W %d%f_%t%-c.%s -preview:all /path/to/files/
The reason your first command failed, as the comments had pointed out, that you didn't name the tag you wanted to extract. The result was a binary dump of every tag in the file.
Additionally, make sure you are using CMD, not PowerShell, as some versions of PS will corrupt binary data that is piped or redirected into a file. See this Exiftool forum post.
With XNView, you can rebuild the embedded thumbnails. Under the Tools menu you would use
Originally by user37960. Source · Licensed CC BY-SA 4.0
user37960
2y ago
0
Generated from our catalog & community — verify before relying on it.
Yes. The issue was likely embedded thumbnail/preview data inside the JPEGs still showing the pre-crop image.
Bridge and XnView can use embedded previews, so if those weren’t updated when the file was cropped, they may keep showing the old full-bed scan even though the main image data is correct.
You can inspect embedded previews with ExifTool, for example by extracting all preview images. If redirecting binary output, use CMD rather than some versions of PowerShell, which can corrupt the output.
To fix it, remove the stale embedded thumbnail and preview data from the JPEGs, e.g. by clearing ThumbnailImage and PreviewImage metadata with ExifTool. After that, XnView should show the correct cropped image, and Bridge should too once its cache is purged.
So the problem is not the actual crop, but outdated embedded preview metadata plus application thumbnail caching.
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