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Old 10-16-2019, 09:02 PM   #15
droopy
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Posts: 834
Karma: 2912460
Join Date: Apr 2009
Device: Kobo Forma
Quote:
Originally Posted by davidfor View Post
Before you do anything else, you should open that book and look at the images. Are they actually high resolution? And try fiddling with a few to see what effect it actually has.
In Calibre, I right-clicked the 500MB ebook and chose "Edit Book". In the left section of the book editor, I scrolled to the Images section and chose a 3.8MB jpg. Yup, it's high-res all right: 1390 x 2000 px. This ebook has a lot of these high-res, several-megabyte JPEG files.
Quote:
Originally Posted by davidfor View Post
And as @NiLuJe, Kobo actually renders in colour. I assume it is writing to the screen that does the gray-scaling. I suspect you won't get any noticeable performance benefit. I would say that space is the only advantage and you can test this manually to see if it is actually worthwhile following it up. Try what @theducks suggested.
I understand that space may be the only advantage. If I could shrink this 450MB ebook down, it would open up a lot of space for more ebooks.

Quote:
Originally Posted by davidfor View Post
Also, this question has come up before. But, no-one has developed a tool to do it. I suspect that means that people who have tried it have found it isn't worth it. Or, they decided that the colour was important and used a tablet for books with lots of pictures. Which is what I would do,
Color is important, especially for this biography of an artist! My plan is to read the text on my Forma and enjoy the full-color, high-res images on a colored device like my laptop.
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