Register Guidelines E-Books Search Today's Posts Mark Forums Read

Go Back   MobileRead Forums > E-Book Readers > Kobo Reader

Notices

Reply
 
Thread Tools Search this Thread
Old 02-22-2013, 07:45 PM   #1
GeoffR
Wizard
GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.
 
GeoffR's Avatar
 
Posts: 1,351
Karma: 2619999
Join Date: Nov 2012
Location: New Zealand
Device: Kobo Glo
Covers sideloaded seperately are more nicely displayed

I noticed that the books I downloaded from Kobo had cover images of various aspect ratios, but were displayed nicely with a properly fitting box around the image, whereas the covers of sideloaded books (whether sent from Calibre or copied manually) were either distorted to fit a 4:3 aspect ratio or did not fit the 4:3 box around the image, leaving ugly while space.

Sending the covers seperately from the book using Calibre also distorts the cover into a 4:3 aspect ratio too.

But if I copy the cover manually from the Calibre library onto my Glo, overwriting the existing cover image ending in N3_FULL.parsed, then the cover is nicely displayed without distortion and with a properly fitting box, just as with the books downloaded from Kobo.

The pictures of the three books on the left show the difference, the first photo is with the books sent from Calibre (same result as sending covers from calibre), the second with the covers copied manually. (The two books on the right of the home screen are kepubs downloaded directly from Kobo).
Attached Thumbnails
Click image for larger version

Name:	SAM_1047.JPG
Views:	185
Size:	201.6 KB
ID:	101741   Click image for larger version

Name:	SAM_1048.JPG
Views:	170
Size:	200.6 KB
ID:	101742  

Last edited by GeoffR; 02-22-2013 at 07:52 PM. Reason: this is with firmware 2.4.0
GeoffR is offline   Reply With Quote
Old 02-22-2013, 08:35 PM   #2
robko
Wizard
robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.robko ought to be getting tired of karma fortunes by now.
 
Posts: 1,256
Karma: 2722720
Join Date: Jul 2010
Device: Kobo
Interesting. I have noticed that somewhere in the more recent firmwares (not sure exactly which one) that kepub covers aren't all the same size/ratio (even accounting for the difference in size depending where they are in carousel) but are more "proper" ratio (i.e newspaper is long and thin rather than near square). Not sure what the difference in the 2 ways of adding that you're seeing but it's likely related.
robko is offline   Reply With Quote
Old 02-22-2013, 10:48 PM   #3
davidfor
Grand Sorcerer
davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.
 
Posts: 5,021
Karma: 4808704
Join Date: Jul 2011
Location: Australia
Device: Kobo Touch, Kobo Glo
As robko said, there was a change in cover handling with FW 2.3.1. The change is how images are resized when used. With previous firmware, the aspect ratio was changed to 3:4 when the image was resized to display. But with 2.3.1, the aspect ratio is not changed when the image is displayed.

The difference that Geoff is seeing is how calibre copies covers over. When it does this, it resizes the covers to three defined sizes. But it doesn't respect the aspect ratio of the covers in the metadata. So, if you use the cover copying options for the driver, they become distorted if they don't happen to have an aspect ratio of 3:4. It is on my list of things to fix. I don't use the options, so I never see it to remind me. And not many people have noticed
davidfor is online now   Reply With Quote
Old 02-23-2013, 03:08 PM   #4
jackie_w
Wizard
jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.jackie_w ought to be getting tired of karma fortunes by now.
 
Posts: 2,710
Karma: 3818505
Join Date: Sep 2009
Location: UK
Device: Sony PRS-350, PB360, Kobo Glo/AuraHD/Aura6"
@david,

Very few of my calibre epub cover jpgs are 3:4 ratio, but then again neither are the 'thumbnail holes' on Home screen, View Details and Library views (both list and cover). Even if the thumbnails themselves are stretched to 3:4 as they are created, once they are displayed they are restretched to perfectly fit the non-3:4 (more like 3:5 ?) thumbnail holes, i.e. they become less 'distorted' again. The only place where the 3:4 thumbnails are displayed in that ratio is when the biggest one is used as a screensaver. But, for me, the edge-to-edge 'distorted' look is a lesser evil than the horrible white sidebars (I realise this is a purely personal preference).

Whatever the calibre driver is doing right now works perfectly for me on fw2.1.5 so I hope you don't 'fix it' too much

P.S. Is there a reason why the N3_FULL.parsed thumbnail is created as 600x800 rather than 758x1024, on the KoboGlo?
jackie_w is offline   Reply With Quote
Old 02-23-2013, 05:23 PM   #5
GeoffR
Wizard
GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.
 
GeoffR's Avatar
 
Posts: 1,351
Karma: 2619999
Join Date: Nov 2012
Location: New Zealand
Device: Kobo Glo
At the moment those who want 3:4 covers without white bars can get that effect by replacing the cover in the epub with Calibre's preserve aspect ratio preference unticked, and letting the device generate the cover from the first page of the book instead of sending the covers seperately using Calibre. But it seems the only way to avoid both the white bars and the 3:4 stretching is to copy the covers manually from outside Calibre.

I have no idea how much work is involved, but I think the ideal would be if Calibre's Kobo driver had:

1. An option to either respect cover aspect ratio or use a fixed 3:4 ratio when sending covers seperately. Maybe this could be taken from Calibre's existing preserve aspect ratio epub preference setting.

2. An option to size covers to suit Mini/Touch/Glo.
GeoffR is offline   Reply With Quote
Old 02-23-2013, 10:57 PM   #6
davidfor
Grand Sorcerer
davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.
 
Posts: 5,021
Karma: 4808704
Join Date: Jul 2011
Location: Australia
Device: Kobo Touch, Kobo Glo
My intentions for cover support are:

- Option to not change aspect ratio when copying the covers from calibre. In fact, it wouldn't resize the cover for the largest version.

- Fix up the sizes for the Glo. The Mini should use the same sizes as the Touch, but I don't have one to check.

- Remove cover images when resending a book. That way the device will recreate them from the current version of the book. I don't plan to add an option for this as this goes along with the action of replacing the book. If any of the other cover options are selected, the covers will be replaced anyway.

I feel there is something else, but I can't think of it at the moment.
davidfor is online now   Reply With Quote
Old 02-25-2013, 12:47 AM   #7
davidfor
Grand Sorcerer
davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.davidfor ought to be getting tired of karma fortunes by now.
 
Posts: 5,021
Karma: 4808704
Join Date: Jul 2011
Location: Australia
Device: Kobo Touch, Kobo Glo
OK, that wasn't that bad after all.

Geoff, I can't remember if I asked before, but I am going to assume that animal in your avatar is a guinea pig And as Jackie commented... I'll send you both a PM.
davidfor is online now   Reply With Quote
Old 02-26-2013, 04:05 PM   #8
jackastor
Wizard
jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.jackastor ought to be getting tired of karma fortunes by now.
 
jackastor's Avatar
 
Posts: 1,536
Karma: 2604523
Join Date: Jun 2011
Device: iphone stanza, kobo touch,ASUS TF300,KOBO GLO, Kobo Aura HD, Kobo Mini
Quote:
Originally Posted by davidfor View Post
OK, that wasn't that bad after all.

Geoff, I can't remember if I asked before, but I am going to assume that animal in your avatar is a guinea pig And as Jackie commented... I'll send you both a PM.
Looks more like a gerbil or hamster actually

sorry for hijacking your comment
jackastor is offline   Reply With Quote
Old 03-01-2013, 10:28 PM   #9
GeoffR
Wizard
GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.GeoffR ought to be getting tired of karma fortunes by now.
 
GeoffR's Avatar
 
Posts: 1,351
Karma: 2619999
Join Date: Nov 2012
Location: New Zealand
Device: Kobo Glo
Thanks davidfor, the option to keep the aspect ratio for covers sent by Calibre (ver 0.9.21) is very nice. A lot of my books have covers taller and slimmer than 3:4 and look much better now, more like the paper versions.

And for those who don't like it, there are options to set the covers to 3:4 ratio, or not to send them at all (and so let the Kobo generate the cover from the first page of the book). Something for everyone :-)
GeoffR is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Kindle Paperwhite: Missing Sideloaded Covers? Otter Amazon Kindle 64 09-15-2013 07:56 AM
Paperwhite and displayed book covers amjbrown Amazon Kindle 0 02-10-2013 04:51 PM
Covers in Epubs not being displayed on Kobo when transfered from Calibre acail0607 Devices 1 12-12-2011 04:32 AM
Updating covers on sideloaded books timlegge Kobo Reader 8 10-05-2011 11:30 AM
Touch Covers for sideloaded books corpcd Kobo Reader 1 09-24-2011 08:44 AM


All times are GMT -4. The time now is 12:52 AM.


MobileRead.com is a privately owned, operated and funded community.