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Old 10-11-2013, 06:57 AM   #2
Tex2002ans
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Posts: 2,297
Karma: 12126329
Join Date: Jul 2012
Device: Kobo Forma, Nook
Quote:
Originally Posted by DragonflyKing View Post
Has anyone experienced this or could anyone suggest a solution? I don't know if it is limited to the Kobo.
If you can share the EPUB, that would be fantastic. If not, can you please just upload the PNGs (or plop them in a sample EPUB and attach them to the post).

Can't know unless you post the images... I wouldn't mind tossing it on my Nook and seeing how these specific PNGs react... and also doing much closer analysis of the PNGs themselves.

Quote:
Originally Posted by DragonflyKing View Post
Has anyone experienced this or could anyone suggest a solution? I don't know if it is limited to the Kobo.
I recently stumbled upon some problems with certain Grayscale + Alpha PNGs here:

https://www.mobileread.com/forums/sho...d.php?t=223254

And also helping figure out some problems with 2-bit and 4-bit PNGs (which yours could potentially be):

https://www.mobileread.com/forums/sho...d.php?t=222916

As a side note: I have a sample PNG Test EPUB in both topics. Stick that on your Kobo and let me know how/if the Kobo displays all the PNGs.

Quote:
Originally Posted by DragonflyKing View Post
I would like to keep the images in PNG format as a typical 17KB PNG image becomes a nasty 132KB when saved as JPG. I could reduce the JPG quality but I have to use a 90% compression factor to get the same size file while the image looks muddy and awful. As most images are a large white expanse with crisp black lines, I want to preserve this as much as possible.
I like the way you think friend (I too am a huge proponent of PNG)!

Last edited by Tex2002ans; 10-11-2013 at 07:01 AM.
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