Quote:
Originally Posted by PatNY
I have noticed that on a few thumbnails in the book details page, the color is very splotchy. It is ONLY apparent with covers with big areas of a bright red color. I don't notice it on any other colors, or even on darker reds/maroons. Just bright red. See attached screenshot of one such book.
Does android not like the color red? 
Seriously, is there any way to avoid this? If the tradeoff were a much larger database or a slower import, I fully understand the preference to keep things the way they are. But perhaps there can be some tweak that doesn't negatively impact some other area?
I have my thumbnails set to large in the book details page. The book cover image is 1406 x 2104 pixels and is 274 KB. I have book covers on my device that are larger than that but don't notice any peculiarities in the thumbnails like with the red ones. And viewed at 100% on my computer it looks fine. If you'd like, I can send you the actual cover image.
--Pat |
Quote:
Originally Posted by jackie_w
@Pat,
Re: red in covers. I've noticed that calibre itself also seems to have a problem with large areas of red when you drag/drop the cover to update the metadata. I've always assumed it was something to do with jpg compression but as I don't understand the nitty-gritty of image processing I've never pursued it. In calibre I can get round it by renaming the original (good-looking) image to cover.jpg and manually copying it to the calibre book folder but I've no idea how to get round it in CC.
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CC does nothing special with covers. To be precise, when CC connects and asks for metadata:
0) You add a cover to calibre. I don't think that the cover is processed at all.
1) Calibre creates a cover "thumbnail", usually 320 pix by 320 pix, aspect ratio respected. Tool = imagemagick, format = jpg, compression quality = .7
2) Calibre sends that thumb to CC.
3) When needed, CC explodes the jpg into a bitmap with standard Android tools. Usually the image is sized down (made smaller), but it is possible that it might be sized up a bit.
My guess is that it is the step in calibre/imageMagick that doesn't like red, but I don't know that. If you send me the cover I will try to find out what tool is causing the problems.