Device View: Why do covers sometimes appear in the wrong colours?

ownedbycats · 11-06-2020, 08:35 PM

In Calibre, sometimes viewing books in the details pane of the device view show their covers with what looks like reversed RGB values. It happens on both sideloaded and non-sideloaded books, but not all of them.

Copying the covers to a test book or image editor retain the wrong colours. Since my device is eInk I'm not sure if the wrong colours are retained there.

Is this supposed to happen?

ownedbycats · 11-10-2020, 04:34 AM

Now it just randomly happened to another book on my device (not sideloaded). I haven't even opened the book on the device since I last plugged in.

Trying to right click on the cover and opening it in an image viewer results in nothing happening.

For the non-DRM'd books with weird covers, the covers embedded in the ePub themselves are fine.

I tried to open the cover directory on my Kobo to see if it was a problem with my device but it was all PARSED files.

ownedbycats · 11-10-2020, 04:52 AM

Removing the covers with Kobo Utilities and letting my device re-generate them results in....every single cover getting inverted. wtf?

EDIT: I moved it over here - https://www.mobileread.com/forums/sh...56#post4056556

11-06-2020, 08:35 PM	#1
ownedbycats Custom User Title Posts: 10,877 Karma: 74203799 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD	Device View: Why do covers sometimes appear in the wrong colours? In Calibre, sometimes viewing books in the details pane of the device view show their covers with what looks like reversed RGB values. It happens on both sideloaded and non-sideloaded books, but not all of them. Copying the covers to a test book or image editor retain the wrong colours. Since my device is eInk I'm not sure if the wrong colours are retained there. Is this supposed to happen? Last edited by ownedbycats; 11-06-2020 at 10:38 PM.

11-10-2020, 04:34 AM	#2
ownedbycats Custom User Title Posts: 10,877 Karma: 74203799 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD	Now it just randomly happened to another book on my device (not sideloaded). I haven't even opened the book on the device since I last plugged in. Trying to right click on the cover and opening it in an image viewer results in nothing happening. For the non-DRM'd books with weird covers, the covers embedded in the ePub themselves are fine. I tried to open the cover directory on my Kobo to see if it was a problem with my device but it was all PARSED files. Attached Thumbnails Last edited by ownedbycats; 11-10-2020 at 04:45 AM.

11-10-2020, 04:52 AM	#3
ownedbycats Custom User Title Posts: 10,877 Karma: 74203799 Join Date: Oct 2018 Location: Canada Device: Kobo Libra H2O, formerly Aura HD	Removing the covers with Kobo Utilities and letting my device re-generate them results in....every single cover getting inverted. wtf? EDIT: I moved it over here - https://www.mobileread.com/forums/sh...56#post4056556 Last edited by ownedbycats; 11-10-2020 at 05:01 AM.

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