06-20-2024, 12:26 PM | #1 |
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Image conversion changed btwn 6.14.1 and 7.12.0
I apologize in advance if I have simply missed the release note item that calls this out, but I needed to downgrade to 6.14.1 from 7.12.0 today because Apple told me that my image files in the generated ePub were too big.
Example: image1: 7.12.0: 4.49 Mb 2664 x 2991 6.14.1: 99.4 Kb 749 x 842 I first tried use the lossless approach and manipulate the ePub from the Calibre tools menu, but the overall dimensions of the image was still too big, even though the size of the image files was reduced. So I opted to downgrade to 6.14.1 and that solved the problem. So I would like to know if there is a specific configuration change that I can make in newer versions, specifically 7.12.0 at the moment, which will perform the same image conversion that I am used to seeing in version 6.14.1. The source document is a docx in both cases and I was able to test on both Windows 10 and Windows 11 to know that this is not an OS issue. In both cases the MS Word document is configured to preserve images at 220 dpi and the source file is the same in both cases, just to be clear. For now I have "solved" my issue, but I would like to know that at some point I will be able to upgrade to newer versions of Calibre. Thank you for your help and insights! |
06-20-2024, 03:07 PM | #2 |
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This is something that should be fixed in your source. In over 10 years I've never had to have Calibre change images, or had an an image issue with Amazon, Apple, Barnes&Noble, Kobo, Google Playbooks, Smashwords etc.
Note that MS Word tools are only affecting appearance for paper/PDF. Fix images outside Word or LO Writer. (Any decent editing program, but not any MS product or tool). 2664 x 2991 is a crazy size for an ebook. |
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06-20-2024, 08:53 PM | #3 |
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Look under the EPUB Output section of the conversion dialog.
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06-20-2024, 09:10 PM | #4 |
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I make it a practice to resize, resample, compress image files destined for embedding before I insert them in the DOCX, EPUB, PDF… whatever. If that means having different versions of the same images then so be it; my asset management practices take care of that.
Check this setting in calibre: If it is set as shown, calibre leaves images alone, and Word will do the same if you have its Advanced Options set like this: I do all I can to avoid Apple products. They do too many things just because… BR |
06-21-2024, 05:24 AM | #5 |
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^^^ What BetterRead writes!
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06-21-2024, 10:05 AM | #6 |
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What change was made between 6.14.1 and 7.12.0?
Hi Covid,
I did look at the EPUB output section of the Conversion workflow, but I do not see something that is obvious to make the image changes that used to happen without me taking any actions other than to convert the docx to epub. Did you make changes to Calibre between 6.14.1 and 7.x that affected the way images are processed in a docx file during the conversion to epub? Many thanks again for you insight and intimate knowledge of the tool! Jonathan |
06-21-2024, 01:38 PM | #7 |
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Did you try making a change to Shrink images larger than: in the EPUB output options? That would appear to be close to what you wanted. See attached image.
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06-24-2024, 02:06 PM | #8 | |
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Quote:
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06-26-2024, 01:11 PM | #9 | |
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Quote:
====================== Starting with 6.14.1: Apple: 749x842 for Map of England, 749x694 for Scandinavia and Gotland and the trip of 749x842. Runes are 113x113 as they should be... B&N: 576x648 and 576x534 and runes are 113x113 Kobo: 512x576 and 512x474 and runes are 113x113 Now, upgrade to 7.12.0 and try to generate with the correct shrinkage for each platform: Apple: using sizes from 6141: 749x842, get 749x842 and 749x693 (odd) and runes and dingbats are correct. B&N: using sizes from 6141: 576x648, get 576x646 (odd) and 576x533 (odd) and runes and dingbats are correct...so there is some minor difference on Nook Kobo: using sizes from 6141: 512x576, get as expected, 512x576 for the Map of England, 512x474 for others and runes and dingbat are correct at 113x113 and 150x28. ====================== Notice the minor differences in the height of the reduced images on Apple and Kobo for some of the images. Again these are minor size issues and must be related to the algorithms used in Calibre I believe since the source images were the same exact dimensions in the MS Word source documents. So I think I am all set to use 7.12.0 and later with the shrink factors I was able to determine based on 6.14.1 output. If anyone has any further suggestions or if there is in fact something that Covid might want to review and tweak that would be much appreciated. Thank you to everyone who already contributed to this thread. |
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06-26-2024, 02:36 PM | #10 |
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Just BTW, his name is Kovid Goyal not Covid.
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06-26-2024, 03:53 PM | #11 | |
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Quote:
Then later some would have the CSS edited to a percent width and height: auto; Calibre is the wrong tool to actually resize images when you have the source. |
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06-26-2024, 03:56 PM | #12 |
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My corvids also have bone to pick the WHO naming. It's Corvids Press, not Covids Press. The ’ is left out for stylistic reasons. I hope Lynne Truss doesn't appear at the door with what might look like a jar of tadpoles.
See “Eats Shoots and Leaves”. |
06-26-2024, 07:58 PM | #13 | |
null operator (he/him)
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Quote:
BR Last edited by BetterRed; 06-26-2024 at 09:08 PM. Reason: grammar |
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06-27-2024, 01:31 AM | #14 |
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My sincere apologies to Kovid.
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06-27-2024, 01:41 AM | #15 | |
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The right tool to resize images
Quote:
Apple: 749x842 for Map of England B&N: 576x648 for Map of England Kobo: 512x576 for Map of England These are clearly what are required. And again these are based on the output that I was getting from Calibre 6.14.1 and which produce an output that looks good on the specified platforms. I certainly can do this, but I am wondering what is wrong with the output of the images from Calibre. What is wrong with the reduced images output from Calibre? |
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Tags |
6.14.1, 7.12.0, change after update, image conversion |
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