Problem editing EPUBs.

Batthews · 08-01-2025, 04:30 PM

About three years ago I upgraded from Kindle 4 possibly (Kindle was bought circa 2012) to a Paperwhite Signature edition, which I am happy with. However when it came to importing the books from my new Kindle to Calibre, the images from files in KFX format only showed up in black and white. Fortunately I had the foresight to save all the files from my old Kindle on to a USB stick so can access those. I am trying to replace the images on the EPUB files I have converted from KFX format with the colour ones I have access to. However occasionally this does not work and when I open the EPUB file I have saved the cover still shows the original black and white image. I have tried resizing the original colour image with Calibre’s edit feature, but even this does not work?

theducks · 08-01-2025, 08:23 PM

Does Calibe details show a color cover?
Did you embed this into the book (polish, modify EPUB)
Lastly, if you are sending to device: Is it NOT SET TO SEND A b&w COVER.

Batthews · 08-21-2025, 04:39 PM

I fixed it by using the edit metadata tab. One thing I did find confusing is that I noticed that a lot of the black and white images were actually larger files than the colour ones despite being the same pixel size (sic)? Although the colour ones were in a different file format to the black and white, as colour were .jpg and the black and white ones were .jpeg?

Quoth · 08-22-2025, 04:05 AM

jpg and jpeg are the same format.

theducks · 08-22-2025, 05:09 AM

And within that there are dozens of settings when the were created.
Color depth, compression, resolution.

Think old school film SLR. You chose speed of shutter, aperture, focal length and even film type.
Many of these limit the top end of the capture. From there, you only can go lower.
In Digital cameras You sacrifice fine details for speed or small file size.
Once done, they are gone. As tech has progressed, it has been able to GUESS some of the lost details and fake them. (I have been around tech for decades and some of what they do these days is absolute magic)

08-01-2025, 04:30 PM	#1
Batthews Junior Member Posts: 5 Karma: 10 Join Date: Dec 2017 Device: Kindle Paperwhite Signature Edition	Problem editing EPUBs. About three years ago I upgraded from Kindle 4 possibly (Kindle was bought circa 2012) to a Paperwhite Signature edition, which I am happy with. However when it came to importing the books from my new Kindle to Calibre, the images from files in KFX format only showed up in black and white. Fortunately I had the foresight to save all the files from my old Kindle on to a USB stick so can access those. I am trying to replace the images on the EPUB files I have converted from KFX format with the colour ones I have access to. However occasionally this does not work and when I open the EPUB file I have saved the cover still shows the original black and white image. I have tried resizing the original colour image with Calibre’s edit feature, but even this does not work?

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08-01-2025, 08:23 PM	#2
theducks Well trained by Cats Posts: 31,224 Karma: 60406678 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	Does Calibe details show a color cover? Did you embed this into the book (polish, modify EPUB) Lastly, if you are sending to device: Is it NOT SET TO SEND A b&w COVER.

08-21-2025, 04:39 PM	#3
Batthews Junior Member Posts: 5 Karma: 10 Join Date: Dec 2017 Device: Kindle Paperwhite Signature Edition	I fixed it by using the edit metadata tab. One thing I did find confusing is that I noticed that a lot of the black and white images were actually larger files than the colour ones despite being the same pixel size (sic)? Although the colour ones were in a different file format to the black and white, as colour were .jpg and the black and white ones were .jpeg?

08-22-2025, 04:05 AM	#4
Quoth Still reading Posts: 14,853 Karma: 110486575 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	jpg and jpeg are the same format.

08-22-2025, 05:09 AM	#5
theducks Well trained by Cats Posts: 31,224 Karma: 60406678 Join Date: Aug 2009 Location: The Central Coast of California Device: Kobo Libra2,Kobo Aura2v1, K4NT(Fixed: New Bat.), Galaxy Tab A	And within that there are dozens of settings when the were created. Color depth, compression, resolution. Think old school film SLR. You chose speed of shutter, aperture, focal length and even film type. Many of these limit the top end of the capture. From there, you only can go lower. In Digital cameras You sacrifice fine details for speed or small file size. Once done, they are gone. As tech has progressed, it has been able to GUESS some of the lost details and fake them. (I have been around tech for decades and some of what they do these days is absolute magic)

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