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Old 03-02-2025, 12:09 PM   #1
roncio
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Cover compression doesn't save
I think a found a bug, apparently when you compress the cover.jpg (looseless) and save the edited ebook, and re-edit it again you will see that the cover jpg compression is not saved (it has the same file size, you can even check it if you open the ebook path in explorer)
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Old 03-02-2025, 06:38 PM   #2
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That is because by default all metadata including the cover is updated from the version in the calibre database when you open the editor. You can turn this offf if you prefer in the editor preferences under calibre integration.
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Old 03-03-2025, 10:12 AM   #3
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Quote:
Originally Posted by kovidgoyal View Post
That is because by default all metadata including the cover is updated from the version in the calibre database when you open the editor. You can turn this offf if you prefer in the editor preferences under calibre integration.
So that's because the cover image is editable in Calibre (outside the editor) and it restores the "outside" cover image?

All other images inside the ebook in the editor are correctly saves after compression -> that's because you can't mod them in Calibre (outside the editor)?
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Old 03-04-2025, 06:56 AM   #4
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Quote:
Originally Posted by roncio View Post
So that's because the cover image is editable in Calibre (outside the editor) and it restores the "outside" cover image?

All other images inside the ebook in the editor are correctly saves after compression -> that's because you can't mod them in Calibre (outside the editor)?
Calibre uses the current (Library) Metadata for operations in a few cases.
The Editor allows that feature to be disabled. But if you use one of the other instances like (send to device), It will be done again FOR THE COPY
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Old 03-04-2025, 02:32 PM   #5
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Quote:
Originally Posted by roncio View Post

All other images inside the ebook in the editor are correctly saves after compression -> that's because you can't mod them in Calibre (outside the editor)?
The File Browser->Open with feature allows you to modify and replace a file using external programs, e.g I have this for images formats:

Click image for larger version Name: Screenshot 2025-03-05 062100.jpg Views: 81 Size: 166.2 KB ID: 214098

BR
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Old 03-08-2025, 10:01 AM   #6
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Just adding that even Polish books compress is "fake" compressing the cover.jpg: it says it succesfully compressed the cover, but if you "Edit book" the cover.jps is reverted to previous size before the compression.
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Old 03-08-2025, 10:16 AM   #7
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I even tried this, turning it off from the Editor preferences it compress the cover.jpg, but even if i embed the metadata and the cover again, as soon as i turn the option on again it restores the old uncompressed cover.jpg.
Apparently i can't find a way to keep the compressed cover, it's always reverted back
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Old 03-09-2025, 10:01 AM   #8
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I wonder if you're seeing some interaction with calibre and the Original Epub? I don't recall exactly what creates the Original Epub format and what calibre commands use it rather than the Epub.

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