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

Go Back   MobileRead Forums > E-Book Formats > ePub

Notices

Reply
 
Thread Tools Search this Thread
Old 06-03-2013, 01:19 PM   #1
Kasper Hviid
Zealot
Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.
 
Posts: 139
Karma: 2784614
Join Date: Nov 2012
Device: none
What is the right size for images in epub?

Since ebook readers have different resolutions, I would normally aim at an oversize image which then gets scaled down in the reader. But when I tried a 2712 x 1465 jpeg, my reader simply ignored it. Given that I have a screensize of 1440 x 1080, it isn't even that much oversize.

The covers of all public domain books are low-res, like 520x800px. I can clearly see each pixel.

What is the right choice for image size in epub? What would look the best on most devices?
Kasper Hviid is offline   Reply With Quote
Old 06-03-2013, 01:51 PM   #2
DaleDe
Grand Sorcerer
DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.
 
DaleDe's Avatar
 
Posts: 10,522
Karma: 9826952
Join Date: Aug 2007
Location: Grass Valley, CA
Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2
The public domain eBooks are targeted at 800 x 600 screen resolution for the most part. You should not exceed 4 Mega pixels as some devices cannot handle anything bigger. Your reader should have handled a 4 Mega pixel image I would have thought. Perhaps it was the aspect ratio that gave it trouble. I would suggest you try some other values with your reader and see how it scales things. You might just have a worst case reader. I see you sign on says you have no device.

Dale
DaleDe is offline   Reply With Quote
 
Advertisement
Old 06-03-2013, 02:07 PM   #3
Kasper Hviid
Zealot
Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.
 
Posts: 139
Karma: 2784614
Join Date: Nov 2012
Device: none
Sorry, I didn't feel like typing in hardware data when I registered. My device is a Kobo Aura HD. (In defence of my device, I will mention that it renders my .cbz version of SideWalk Bubblegum perfectly - and that's 2275x2333 pixels png's in 1 bit.)

You mention a max size of 4 mega pixels - will I be safe if I just keep below that, or is 'almost-4-mega-pixel' images also a risk?

I like having things working on my own reader, but what I'm after is mostly being able to produce epub files that works almost everywhere.
Kasper Hviid is offline   Reply With Quote
Old 06-03-2013, 02:24 PM   #4
DaleDe
Grand Sorcerer
DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.DaleDe ought to be getting tired of karma fortunes by now.
 
DaleDe's Avatar
 
Posts: 10,522
Karma: 9826952
Join Date: Aug 2007
Location: Grass Valley, CA
Device: EB 1150, EZ Reader, Literati, iPad 2 & Air 2
Quote:
Originally Posted by Kasper Hviid View Post
Sorry, I didn't feel like typing in hardware data when I registered. My device is a Kobo Aura HD. (In defence of my device, I will mention that it renders my .cbz version of SideWalk Bubblegum perfectly - and that's 2275x2333 pixels png's in 1 bit.)

You mention a max size of 4 mega pixels - will I be safe if I just keep below that, or is 'almost-4-mega-pixel' images also a risk?

I like having things working on my own reader, but what I'm after is mostly being able to produce epub files that works almost everywhere.
My experience is yes you will be safe up to 4 MPixel. and probably up to the binary equivalent since memory boundaries are involved and the limit is likely due to a staging area in memory where the image is rescaled. 4,194,304 would be the upper size based on boundaries.
DaleDe is offline   Reply With Quote
Old 06-03-2013, 03:07 PM   #5
Kasper Hviid
Zealot
Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.Kasper Hviid ought to be getting tired of karma fortunes by now.
 
Posts: 139
Karma: 2784614
Join Date: Nov 2012
Device: none
Thanks, it is really helpful to have a fixed max value. Hey, I just tried 1500x810 pixels, which works! :-)
Kasper Hviid 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
XGA Images - size just right? trevorburdon ePub 7 05-06-2012 05:13 AM
Size of page images for Kindle gdgibson Kindle Formats 3 02-16-2012 03:56 AM
Size of images in OPDS catalog dgillmac Related Tools 1 02-06-2012 02:50 PM
How to stop images from doubling size? bfollowell Amazon Kindle 2 10-12-2010 10:55 PM
Images for different size readers JSWolf ePub 2 12-31-2009 12:29 PM


All times are GMT -4. The time now is 06:18 PM.


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