Mobi to ePub conversion - cover aspect ratio being messed up

HarryT · 04-13-2012, 04:17 AM

Yesterday, I uploaded a revised version of my Edgar Rice Burroughs "Barsoom Omnibus" to the library here at MR.

The Mobi version of the book, created with Mobipocket Publisher, has a cover which looks absolutely fine. The cover is 600 pixels wide x 800 pixels high, and is displayed correctly.

I then used Calibre to convert the Mobi version of the book to ePub, and in the ePub version the cover appears vertically compressed.

JSWolf has kindly looked at the ePub for me, and advised me that the ePub cover incorrectly has:

Code:

preserveAspectRatio="none"

whereas it shouldbe:

Code:

preserveAspectRatio="xMidYMid meet"

Is there any way to change this in Calibre? The cover was added to the Mobi book in the usual way (ie via the "Guide" section of the OPF), so there's nothing explicitly in the book which determines its aspect ratio - I simply want it to use the full size of the supplied cover image - 600x800 pixels.

If it would be useful to see the books, the Mobi version is at:

https://www.mobileread.com/forums/showthread.php?t=12782

and the converted ePub is at:

https://www.mobileread.com/forums/showthread.php?t=54599

The conversion was done with Calibre 0.8.46 using default conversion settings.

Any help with this would be much appreciated.

Thanks,

kovidgoyal · 04-13-2012, 04:19 AM

Look under epub options in the conversion dialog.

HarryT · 04-13-2012, 04:26 AM

Thanks for the rapid response, Kovid. Checking the "Preserve cover aspect ratio" box appears to have sorted the problem.

Much appreciated!

Alda · 06-28-2012, 06:53 PM

Hi - can either of you help me find the "preserve cover aspect ratio" in Calibre? No doubt it's staring me right in the face, but I've now spent 15 minutes going through everything in the conversion menu and don't see it. I'm using 0.8.57.

Thank you!

kiwidude · 06-28-2012, 06:57 PM

Its on the ePub Output options tab. You can also change it as an overall default in Preferences -> Output Options -> ePub Output

Alda · 06-28-2012, 07:08 PM

Thank you!!

04-13-2012, 04:17 AM	#1
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383043 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	Mobi to ePub conversion - cover aspect ratio being messed up Yesterday, I uploaded a revised version of my Edgar Rice Burroughs "Barsoom Omnibus" to the library here at MR. The Mobi version of the book, created with Mobipocket Publisher, has a cover which looks absolutely fine. The cover is 600 pixels wide x 800 pixels high, and is displayed correctly. I then used Calibre to convert the Mobi version of the book to ePub, and in the ePub version the cover appears vertically compressed. JSWolf has kindly looked at the ePub for me, and advised me that the ePub cover incorrectly has: Code: preserveAspectRatio="none" whereas it shouldbe: Code: preserveAspectRatio="xMidYMid meet" Is there any way to change this in Calibre? The cover was added to the Mobi book in the usual way (ie via the "Guide" section of the OPF), so there's nothing explicitly in the book which determines its aspect ratio - I simply want it to use the full size of the supplied cover image - 600x800 pixels. If it would be useful to see the books, the Mobi version is at: https://www.mobileread.com/forums/showthread.php?t=12782 and the converted ePub is at: https://www.mobileread.com/forums/showthread.php?t=54599 The conversion was done with Calibre 0.8.46 using default conversion settings. Any help with this would be much appreciated. Thanks,

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04-13-2012, 04:19 AM	#2
kovidgoyal creator of calibre Posts: 43,826 Karma: 22666666 Join Date: Oct 2006 Location: Mumbai, India Device: Various	Look under epub options in the conversion dialog.

04-13-2012, 04:26 AM	#3
HarryT eBook Enthusiast Posts: 85,544 Karma: 93383043 Join Date: Nov 2006 Location: UK Device: Kindle Oasis 2, iPad Pro 10.5", iPhone 6	Thanks for the rapid response, Kovid. Checking the "Preserve cover aspect ratio" box appears to have sorted the problem. Much appreciated!

06-28-2012, 06:53 PM	#4
Alda Zealot Posts: 104 Karma: 22 Join Date: Jun 2010 Device: none	Hi - can either of you help me find the "preserve cover aspect ratio" in Calibre? No doubt it's staring me right in the face, but I've now spent 15 minutes going through everything in the conversion menu and don't see it. I'm using 0.8.57. Thank you!

06-28-2012, 06:57 PM	#5
kiwidude Calibre Plugins Developer Posts: 4,635 Karma: 2162064 Join Date: Oct 2010 Location: Australia Device: Kindle Oasis	Its on the ePub Output options tab. You can also change it as an overall default in Preferences -> Output Options -> ePub Output

06-28-2012, 07:08 PM	#6
Alda Zealot Posts: 104 Karma: 22 Join Date: Jun 2010 Device: none	Thank you!!