How? Resize all images in epub to veiwport size

Robert Hoover · 06-05-2021, 06:28 AM

The cover image automatically resizes depending on the viewport size used. Is there some way to make all the interior images also resize to match the viewport size?

I would like to create comic books in epub format, and mobi and azw3 if possible, where the image will fill the viewport of the device used to read the comic books.

Any help on this would be deeply appreciated.

Thanks

Robert

kovidgoyal · 06-05-2021, 11:46 AM

Yes, use the same svg markup as for the cover. If you use the calibre editor, it has an insert image button with a "full page image' checkbox that will generate the markup for you.

jhowell · 06-05-2021, 11:50 AM

For a reflowable EPUB you can use an SVG wrapper around images to make them fit as large as possible on the screen without distortion. That should work in calibre and many EPUB readers.

Another approach is to create a fixed-layout EPUB. Support for that within calibre is very limited. For other platforms support varies and may require proprietary markup.

On the Kindle platform comic viewing works in KF8 (azw3) and KFX formats, but not MOBI without KF8. The proprietary markup needed is documented in the Kindle Publishing Guidelines. It will likely be easier to produce a Kindle comic using software such as Kindle Comic Converter or Amazon's Kindle Comic Creator. If your comic has panels the Kindle can allow viewing it either page-by-page or panel-by-panel.

Another alternative is to use a comic-specific format, such as CBR or CBZ. You can read that in calibre and in comic-specific apps, but not on Kindle.

(This thread will likely be moved by a moderator since it is not appropriate for the calibre development sub-forum.)

06-05-2021, 06:28 AM	#1
Robert Hoover Junior Member Posts: 1 Karma: 10 Join Date: Jun 2021 Device: none	How? Resize all images in epub to veiwport size The cover image automatically resizes depending on the viewport size used. Is there some way to make all the interior images also resize to match the viewport size? I would like to create comic books in epub format, and mobi and azw3 if possible, where the image will fill the viewport of the device used to read the comic books. Any help on this would be deeply appreciated. Thanks Robert

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06-05-2021, 11:46 AM	#2
kovidgoyal creator of calibre Posts: 43,858 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Yes, use the same svg markup as for the cover. If you use the calibre editor, it has an insert image button with a "full page image' checkbox that will generate the markup for you.

06-05-2021, 11:50 AM	#3
jhowell Grand Sorcerer Posts: 6,497 Karma: 84420419 Join Date: Nov 2011 Location: Tampa Bay, Florida Device: Kindles	For a reflowable EPUB you can use an SVG wrapper around images to make them fit as large as possible on the screen without distortion. That should work in calibre and many EPUB readers. Another approach is to create a fixed-layout EPUB. Support for that within calibre is very limited. For other platforms support varies and may require proprietary markup. On the Kindle platform comic viewing works in KF8 (azw3) and KFX formats, but not MOBI without KF8. The proprietary markup needed is documented in the Kindle Publishing Guidelines. It will likely be easier to produce a Kindle comic using software such as Kindle Comic Converter or Amazon's Kindle Comic Creator. If your comic has panels the Kindle can allow viewing it either page-by-page or panel-by-panel. Another alternative is to use a comic-specific format, such as CBR or CBZ. You can read that in calibre and in comic-specific apps, but not on Kindle. (This thread will likely be moved by a moderator since it is not appropriate for the calibre development sub-forum.)

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