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Thread: How to create internal eBook images that will not be changed when submitted


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Permlink Replies: 6 - Pages: 1 - Last Post: Sep 13, 2013 6:51 AM Last Post By: linsherman
Anthony

Posts: 31
Registered: 09/10/13
How to create internal eBook images that will not be changed when submitted
Posted: Sep 10, 2013 3:42 AM
 
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Hello,

I would like to ensure that the internal images I create for my eBook will not be modified by the upload/Kindle Gen process when I submit my eBook to Amazon. Is it possible to know for sure what the requirements are that I need to stay within to make sure that the images I submit will be the same quality/size/format as when I submitted them?

I don't want to do a ton of work creating illustrations and have them resized or the quality drastically degraded when I submit the eBook.

Here is what I think I need to stay within in order to accomplish this:
  • internal image file size must be 127Kb or less
  • internal image dimensions must be no larger than 600x800 pixels
  • image format must be JPG or GIF

Is this correct? If I "optimize" the images myself and submit images that meet those requirements, will Amazon leave my images alone, or is there a possibility that they will still be changed?

Any help would be appreciated.

Thank you.
linsherman

Posts: 187
Registered: 05/12/12
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 10, 2013 8:59 AM   in response to: Anthony in response to: Anthony
 
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It would take a book to get into all the issues with images.

Are these photographic quality images? Is the book primarily about the art or the text? Knowing this will help a bit.

For example, if this is about the art and you are primarily interested in displaying photographic-quality color images on the Kindle Fire, that's a different can of worms than, say, putting together an e-book full of detailed black-and-white line drawings that could be displayed on any Kindle.
Notjohn

Posts: 21,608
Registered: 02/27/13
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 10, 2013 10:33 AM   in response to: Anthony in response to: Anthony
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internal image file size must be 127Kb or less

Right.

internal image dimensions must be no larger than 600x800 pixels

I use 800 wide and however tall, for better results on the larger tablets. (I still keep them under 127KB, however.) I also specify width=100% because that's the only way to get full width on the 8.9 inch Fire.

image format must be JPG or GIF

Right.

Good luck! -- NJ

The book: Notjohn's Guide to Kindle Publishing: Ten Steps to Selling Your E-book on Amazon (Or Anywhere Else) (Third Edition)

The blog: Notjohn's KDP Guide
Anthony

Posts: 31
Registered: 09/10/13
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 10, 2013 2:38 PM   in response to: linsherman in response to: linsherman
 
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The images in the book will be stock photography color photographs and not really line art - just photos to support and help illustrate the content. So I'm assuming that as long as I keep everything under 127 Kb then the Amazon conversion process shouldn't modify the image on me...

Thanks again!
cjeasyaspie

Posts: 2,655
Registered: 05/28/09
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 12, 2013 7:11 PM   in response to: Anthony in response to: Anthony
 
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Is this correct? If I "optimize" the images myself and submit images that meet those requirements, will Amazon leave my images alone, or is there a possibility that they will still be changed?

Yes.

The aspect ratio (shape of the image) also affects how images are displayed, especially when zoomed.

600 x 800 works for most screen sizes, but screens for some newer Kindles have different aspect ratios.

Here's where to find the specs:

List of displays by pixel density
http://en.wikipedia.org/wiki/List_of_displays_by_pixel_density#Amazon

The info is in a table that displays the following:

Amazon
Model Diagonal cm (in) Resolution ppcm (PPI) Aspect ratio CSS pixel ratio
Kindle Fire HD 8.9"10 23 (8.9) 1920x1200 100 (254) 16:10 (1.6:1) 1.5
Kindle Fire HD 7"11 18 (7) 1280x800 85 (216) 16:10 (1.6:1) 1.5
Kindle Fire12 18 (7) 1024×600 67 (169) 5.12:3 (1.7:1) 1
Kindle DX13 25 (9.7) 824×1200 59 (150) 16:11 (1:1.45)
Kindle Paperwhite, Paperwhite 3G 15 (6) 768×1024 83 (212) 3:4 (1:1.33)
Kindle,14 Kindle Keyboard 3G,15 Touch 3G,16 Touch17 15 (6) 600×800 66 (167) 3:4 (1:1.33)

Happy Kindling,

CJ, at CJ's Easy as Pie Kindle Tutorials
http://www.cjs-easy-as-pie.com/
linsherman

Posts: 187
Registered: 05/12/12
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 13, 2013 6:34 AM   in response to: Anthony in response to: Anthony
 
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Well, as cieasyaspie pointed out, different devices have different aspect ratios and resolutions. There's also the issue of displaying color images on grayscale devices.

So it kind of comes down to what you mean by "changed".

If you want the image to display at roughly the same size on all devices, without loss of quality, you will need more than one version of the image, and you will have to work directly with the HTML and CSS, using media queries to display the best image for the device based and set the image viewport's size correctly. If you want it to look nice on the e-inkers, you will have to load it into a high-end photo editor like Photoshop or GIMP and create a filtered grayscale version that doesn't look like a mud painting.

In other words, it can get pretty technical. The hardest part of formatting an e-book, even one with no images, is getting it to look halfway acceptable on all these different devices.

Not trying to discourage you, just want to make you aware of these issues.

If you're okay with the image being "small" on HD devices and flat-looking on grayscale ones, then just add the images as is to your e-book. If not, you will have some work to do.

Cheers,
Lin
Simplified HTML & CSS for E-Books
linsherman

Posts: 187
Registered: 05/12/12
Re: How to create internal eBook images that will not be changed when submitted
Posted: Sep 13, 2013 6:51 AM   in response to: Notjohn in response to: Notjohn
 
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Notjohn wrote:
internal image file size must be 127Kb or less

I use 800 wide and however tall, for better results on the larger tablets. (I still keep them under 127KB, however.) I also specify width=100% because that's the only way to get full width on the 8.9 inch Fire.

I'd argue that this is "changing" the image. The device has to insert pixels, which can result in dithering. These are color photographs, so I'm pretty sure that's not what the OP wants to do.

The ideal professional publishing house solution is to use multiple images of different sizes and use CSS media queries to select the best version for a particular device. A properly filtered grayscale version should also be provided for the e-inkers.

Otherwise, it's best to set the height= and width= attributes to the image's actual pixel dimensions and live with the image being small on HD devices.

I wish there were a simple solution that addresses all these issues without having to write CSS media queries, but if there is, I don't know it.

Cheers,
Llin

Simplified HTML & CSS for E-Books
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