Glo Book cover not fullscreen?

MewCore · 08-11-2016, 03:12 AM

Hi, the problem I'm facing is illustrated in the photos I took:

[Image violates Posting Guidelines for size - MODERATOR]

The left one is the first page, and the second is when the device is in sleep mode.

I'm using calibre for epub->kepub conversion and I'm wondering why is there empty space on left and right? This happens to all my ebooks.

I'm using Kobo Glo HD with the latest firmware.

Thank you in advance for any help!

GeoffR · 08-11-2016, 04:07 AM

The space at the sides is because the aspect ratio of the cover image doesn't exactly match the aspect ratio of the screen.

For the cover in the book, it is up to the publisher to choose how to display the image. They can choose to preserve the aspect ratio, or stretch the image to fill the screen. You can change it by editing the book's CSS stylesheet and/or HTML cover page.

For the cover on the sleep screen, the firmware preserves the aspect ratio. But if you want to stretch the cover you can use Calibre to do that by customising the KoboTouch (or KoboTouchExtended?) driver options: Tick the "Upload covers" box, and untick the "Keep cover aspect ratio" box.

(Note that if you resend the book to the device -- or use the KoboUtilities plugin to upload the covers without resending the book -- after changing the cover options, you will probably need to reboot the device before the new cover will show up.)

MewCore · 08-11-2016, 05:10 AM

Quote:

Originally Posted by GeoffR

The space at the sides is because the aspect ratio of the cover image doesn't exactly match the aspect ratio of the screen.

For the cover in the book, it is up to the publisher to choose how to display the image. They can choose to preserve the aspect ratio, or stretch the image to fill the screen. You can change it by editing the book's CSS stylesheet and/or HTML cover page.

For the cover on the sleep screen, the firmware preserves the aspect ratio. But if you want to stretch the cover you can use Calibre to do that by customising the KoboTouch (or KoboTouchExtended?) driver options: Tick the "Upload covers" box, and untick the "Keep cover aspect ratio" box.

(Note that if you resend the book to the device -- or use the KoboUtilities plugin to upload the covers without resending the book -- after changing the cover options, you will probably need to reboot the device before the new cover will show up.)

Fantastic, thank you!

davidfor · 08-11-2016, 06:38 AM

The other thing, is that this is a kepub rather than an epub. The device handles covers for the two types differently. For an epub, the first page is rendered and that is used as the cover. For kepubs, an image in the book is marked as the cover, and this is extracted and used as the cover. It is resized for the various places it is displayed, but the aspect ratio is kept.

What that means is that if you make sure the cover image in the library is the correct aspect ratio, when calibre updates the cover during the conversion or send-to-device, it will put a cover in the book that will fill the screen. I don't really know which of these is the better option.

JSWolf · 08-11-2016, 07:31 AM

In the two photos above, the cover that fills the screen looks stretched because it is stretched. The second cover looks good because it's aspect ratio correct and looks good.

So don't go with a fullscreen cover as some can look really poor stretched. Go with the correct aspect ratio.

jackie_w · 08-11-2016, 08:04 AM

Quote:

Originally Posted by JSWolf

So don't go with a fullscreen cover as some can look really poor stretched. Go with the correct aspect ratio.

So what is the "correct aspect ratio" for imaginary buildings and aircraft

I honestly can't see anything wrong with the pic on the left - even if it is stretched. How would I know it was stretched if the pic on the right wasn't there?

Dr. Drib · 08-11-2016, 01:54 PM

Moderator Notice

Please take a few moments to read our Posting Guidelines, in particular the part about the maximum image size allowed (600x600 pixels). Images that violate those guidelines will be deleted.

It is every member's responsibility to read our Posting Guidelines and follow them.

Thanks.

JSWolf · 08-12-2016, 05:22 AM

Quote:

Originally Posted by jackie_w

So what is the "correct aspect ratio" for imaginary buildings and aircraft

I honestly can't see anything wrong with the pic on the left - even if it is stretched. How would I know it was stretched if the pic on the right wasn't there?

The correct aspect ratio is how it was created. The cover on the right we know is correct because it's a pBook cover and they don't have an aspect that's fullscreen.

Now if your eBook is also going to be a pBook, then you'd be going for the aspect of a pBook cover.

08-11-2016, 03:12 AM	#1
MewCore Junior Member Posts: 8 Karma: 10 Join Date: Sep 2015 Device: Kobo Glo HD	Book cover not fullscreen? Hi, the problem I'm facing is illustrated in the photos I took: [Image violates Posting Guidelines for size - MODERATOR] The left one is the first page, and the second is when the device is in sleep mode. I'm using calibre for epub->kepub conversion and I'm wondering why is there empty space on left and right? This happens to all my ebooks. I'm using Kobo Glo HD with the latest firmware. Thank you in advance for any help! Last edited by Dr. Drib; 08-11-2016 at 01:53 PM.

08-11-2016, 04:07 AM	#2
GeoffR Wizard Posts: 3,821 Karma: 19162882 Join Date: Nov 2012 Location: Te Riu-a-Māui Device: Kobo Glo	The space at the sides is because the aspect ratio of the cover image doesn't exactly match the aspect ratio of the screen. For the cover in the book, it is up to the publisher to choose how to display the image. They can choose to preserve the aspect ratio, or stretch the image to fill the screen. You can change it by editing the book's CSS stylesheet and/or HTML cover page. For the cover on the sleep screen, the firmware preserves the aspect ratio. But if you want to stretch the cover you can use Calibre to do that by customising the KoboTouch (or KoboTouchExtended?) driver options: Tick the "Upload covers" box, and untick the "Keep cover aspect ratio" box. (Note that if you resend the book to the device -- or use the KoboUtilities plugin to upload the covers without resending the book -- after changing the cover options, you will probably need to reboot the device before the new cover will show up.) Attached Thumbnails Last edited by GeoffR; 08-11-2016 at 04:15 AM. Reason: Added screenshot of cover options

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08-11-2016, 06:38 AM	#4
davidfor Grand Sorcerer Posts: 24,906 Karma: 47303822 Join Date: Jul 2011 Location: Sydney, Australia Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos	The other thing, is that this is a kepub rather than an epub. The device handles covers for the two types differently. For an epub, the first page is rendered and that is used as the cover. For kepubs, an image in the book is marked as the cover, and this is extracted and used as the cover. It is resized for the various places it is displayed, but the aspect ratio is kept. What that means is that if you make sure the cover image in the library is the correct aspect ratio, when calibre updates the cover during the conversion or send-to-device, it will put a cover in the book that will fill the screen. I don't really know which of these is the better option.

08-11-2016, 07:31 AM	#5
JSWolf Resident Curmudgeon Posts: 75,021 Karma: 131375774 Join Date: Nov 2006 Location: Roslindale, Massachusetts Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3	In the two photos above, the cover that fills the screen looks stretched because it is stretched. The second cover looks good because it's aspect ratio correct and looks good. So don't go with a fullscreen cover as some can look really poor stretched. Go with the correct aspect ratio.

08-11-2016, 01:54 PM	#7
Dr. Drib Grand Sorcerer Posts: 44,870 Karma: 55647515 Join Date: Jan 2007 Location: Peru Device: Kindle: Oasis 3, Voyage WiFi; Kobo: Libra 2, Aura One	Moderator Notice Please take a few moments to read our Posting Guidelines, in particular the part about the maximum image size allowed (600x600 pixels). Images that violate those guidelines will be deleted. It is every member's responsibility to read our Posting Guidelines and follow them. Thanks.

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