image sizes

PandathePanda · 07-09-2015, 01:01 AM

Just a question.

Is there a limit on how big a picture need to be in MB before it gets too big?

I'm busy with a book with a few images, the images is about 1200x700 (or there about) and after "fixing" I save it to PNG (which make them between 700kb to 1.2mb each). With almost half the images in, the ebook is already over 6mb

eschwartz · 07-09-2015, 07:19 PM

Pictures don't compress very well -- because they are already compressed, of course -- so every kilobyte added is another kilobyte to the final ebook.

As for size limits on attachments here, unless it grows beyond 20 MB you're safe.

Use your best judgment.

Personally, I see no reason for high-quality images in an ebook, as E-Ink devices cannot render them in all their glory anyway. Most of my books only have a cover

and I am used to ebook sizes of ~500 KB.

If you want to save on image size, there are things you can do to optimize it. Various threads have discussed it (mainly in the workshop). The usual recommendations are e.g. for B&W images, to convert to gray colorspace, reduce the colors to 16 shades, strip them of profiles and comments, etc.
To be extra careful, you can run them through a time-consuming round of zopflipng.

Jellby · 07-10-2015, 03:31 AM

Quote:

Originally Posted by eschwartz

Personally, I see no reason for high-quality images in an ebook, as E-Ink devices cannot render them in all their glory anyway.

But ebooks can be read in devices other than e-ink, and the images can be extracted. Just to show that there are some reasons

eschwartz · 07-10-2015, 03:37 AM

Well, some people offer a special high-res ebook for that very reason. I did say "personally", which is of course highly subjective (and rightly so).

Oh well -- I am used to being ignored.

PandathePanda · 07-10-2015, 05:33 AM

Quote:

Originally Posted by eschwartz

Well, some people offer a special high-res ebook for that very reason. I did say "personally", which is of course highly subjective (and rightly so).

Oh well -- I am used to being ignored.

I tested it (as far as I was atm, on my nephew's 7" and it looked decent. On my 10" it looks awesome

I might ditch the PNG for JPG.

AnemicOak · 07-22-2015, 01:22 PM

Quote:

Originally Posted by Jellby

But ebooks can be read in devices other than e-ink, and the images can be extracted. Just to show that there are some reasons

Right. My 8.9" tablet, which I read on sometimes, has a 2560 x 1600 pixel screen so high quality is appreciated especially for things like maps.

07-09-2015, 01:01 AM	#1
PandathePanda a toy panda Posts: 2,567 Karma: 26020474 Join Date: Mar 2014 Location: Onboard the Queen Anne's Revenge Device: Various Android dvices	image sizes Just a question. Is there a limit on how big a picture need to be in MB before it gets too big? I'm busy with a book with a few images, the images is about 1200x700 (or there about) and after "fixing" I save it to PNG (which make them between 700kb to 1.2mb each). With almost half the images in, the ebook is already over 6mb

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07-09-2015, 07:19 PM	#2
eschwartz Ex-Helpdesk Junkie Posts: 19,422 Karma: 85397180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	Pictures don't compress very well -- because they are already compressed, of course -- so every kilobyte added is another kilobyte to the final ebook. As for size limits on attachments here, unless it grows beyond 20 MB you're safe. Use your best judgment. Personally, I see no reason for high-quality images in an ebook, as E-Ink devices cannot render them in all their glory anyway. Most of my books only have a cover and I am used to ebook sizes of ~500 KB. If you want to save on image size, there are things you can do to optimize it. Various threads have discussed it (mainly in the workshop). The usual recommendations are e.g. for B&W images, to convert to gray colorspace, reduce the colors to 16 shades, strip them of profiles and comments, etc. To be extra careful, you can run them through a time-consuming round of zopflipng.

07-10-2015, 03:37 AM	#4
eschwartz Ex-Helpdesk Junkie Posts: 19,422 Karma: 85397180 Join Date: Nov 2012 Location: The Beaten Path, USA, Roundworld, This Side of Infinity Device: Kindle Touch fw5.3.7 (Wifi only)	Well, some people offer a special high-res ebook for that very reason. I did say "personally", which is of course highly subjective (and rightly so). Oh well -- I am used to being ignored.