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Old 04-13-2013, 07:21 PM   #11
BookBunny
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Posts: 36
Karma: 16608
Join Date: Feb 2013
Device: Kobo Glo™
Quote:
Originally Posted by Urdu View Post
I've tried that some time ago but nothing changed. No matter how dark the image the Glo shows an image in an epub in one way only: light, very light compared to the original image.
Works for me™.

@herbert71: Well it is easy, but in this case I had .jpeg files, and the program I use writes only jpg files. They're technically the same thing, but if the html files refer to a jpeg, they won't find the jpg. So if you have jpegs you either have to find another program, a batch file renamer, do it manually or replace all jpeg references in the html files with jpg..

Anyway, here's what I did:

- rename the .epub to .zip,
- open it in explorer,
- copy the image folder to the desktop.

Download this: http://portableapps.com/apps/graphic...nview_portable

Extract, run, hit "b" to open the batch window. Navigate to the image folder and add the files (right side of the batch window). Now select "batch conversion" on the left, output format JPG, check advanced options and change the output directory.

Then click on the "advanced" button. Check "convert to greyscale" and "gamma correction" (0.35 seems a good value, but might require tweaking). Then OK, and start batch.

Now copy the created images back into the zip file (overwrite images) and rename it back to .epub.

You can of course try the other image options too if you want, this probably isn't the optimal way. Also make a backup of the original epub file first!
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Last edited by BookBunny; 04-13-2013 at 07:25 PM.
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