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Code Issues Releases Wiki Activity

add image quality section

Alex Xu
2025-06-03 18:38:13 -07:00
parent 0418c75881
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Bad-Formatting-Examples.md
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Here are some formatting issues I've observed in some Kindle Store manga:
1) faded black levels causing unneccessarily low contrast, which is hard to see and can cause eyestrain.
1. faded black levels causing unneccessarily low contrast, which is hard to see and can cause eyestrain.
![IMG_1507-0001](https://github.com/user-attachments/assets/3fd06257-f415-488e-b639-a619189caa4d)
@@ -18,19 +18,44 @@ demonstrated here with the Humble Bundle version:
Incorrect black levels causes manga to look faded and washed out, and is a lot harder to see and can cause eyestrain.
E-ink is already lower contrast than LCD, there's no need to make the contrast even lower with non-black images in manga.
2) Unneccesary margins, usually at the bottom
2. Unneccesary margins, usually at the bottom
![IMG_1507-0009](https://github.com/user-attachments/assets/97316ea4-0f2e-403c-88c8-1671b201b79e)
Manga should be fullscreen, since most Kindles are much smaller than physical paper volumes.
I've even seen cases where margins are added on all 4 sides, not just the bottom.
3) Incorrect page turn direction for right to left manga.
3. Inferior image quality
Here are some comparisons between manga that isn't and is rendered at the native resolution of my Kindle.
![IMG_1525 2](https://github.com/user-attachments/assets/0fe4ff25-dbd4-46b4-ad66-1de0dd0fb479)
![IMG_1521 2](https://github.com/user-attachments/assets/83f49c3c-f322-47b5-a087-9a3bf85044cc)
The manga that was rendered at my Kindle's native resolution from Kindle Comic Converter is strikingly clear.
The main issue is that most manga on the Kindle Store is created with either KindleGen or Kindle Create.
In practice, this either means a resolution limit of x1920 or x2250 pixels in height.
Instead of a fixed resolution,
creating individual files tailored for a specific device's screen resolution
gives far better results with far fewer resizing artifacts and moire.
Moire can be a big problem due to the screen tones all manga use.
Moreover, the downscaler in kindlegen is very blurry, KCC uses a much sharper LANCOZ downscaler.
KCC also uses technologies like MozJpeg to offer very efficient compression
with minimal artifacting around the text,
which can be very noticeable around page refreshes.
I've noticed Kindle Store manga having very heavy jpg compression artifacts, especially around text.
4) Incorrect page turn direction for right to left manga.
![IMG_1507-0007](https://github.com/user-attachments/assets/1c5e7245-c743-48e9-9e2c-26200f4ebf3b)
4) 2 page spread alignment off by 1
5) 2 page spread alignment off by 1
Sometimes there's a single page misaligned in landscape: