Thread: Images to grayscale
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Old 11-02-2011, 03:01 PM   #13
alansplace
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Cool try this
Quote:
Originally Posted by madeinlisboa View Post
I'm sorry if this is a dup, but I searched and found nothing.

Is it possible to change images to grayscale when a book is converted? In this case from CHM to MOBI. It would lower substantially the final size.
i'd try this workflow:

1. convert to epub using calibre
2. use calibre's right click option 'tweak epub' to explode the epub
3. use IrfanView (free software at cnet) to batch convert all the graphics files.
4. rebuild the epub using the tweak epub window (it should still be open).
5. convert the epub to mobi with calibre.
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