seam_carver

KOReader has built in contrast and dither options that may do what you want.

And a rainbow removal plugin which uses same method.

There are a lot of koreader plugins that implement individual features. Any in particular you want?

But I prefer to preprocess on a pc to maximize ereader battery life.

KCC best features:

1) filesize optimization. Think 600 to 100 mb after optimization per volume depending on source and settings. Does it by downscaling and dithering from 256 to 16 shades of gray (e.g. 8 bit to 4 bit)

2) black level correction. You need pure blacks in eink. Dark gray looks ok on paper and normal screens but not eink. Does it with histogram manipulation

3) semi automatic 2 page spread joining. spreads can be autorotated or not.

4) rainbow removal on kaleido 3 color eink with 2D discrete Fourier transform

Yes, I agree, eink is so close to physical paper. I have shelves of physical manga but eink is close enough to that experience for me.

Ever experienced the bug where usb loaded kepub manga disabled bookmarks and annotations?

https://github.com/ciromattia/kcc/issues/704

Indeed, and my kindle scribe 2022 10.3” 64 GB is bigger than a physical manga volume. I couldn’t imagine using anything smaller

A lot of people still use KCC with non kindles for the file size and page turn performance improvements!

KCC has a feature to combine spreads that I added, I think it works pretty well, photos in readme.

After combining you can autorotate it or not, it’s an option.

macOS 15 still gets security updates.

In Fire Emblem 3 Houses, the final boss of the Azure route has 199 HP and is standing on a 60 HP heal tile.

If you deal 3 damage, it goes to 196. 196+60=256.

This overflows to zero and you win.

You are wrong. Everyone gets it

Tired of iOS 26 bugs. Hopefully this fixes.

I am the developer of an app where its main purpose is to optimize file size and page turn performance of comics/manga on low-powered ereaders like Kobo: https://github.com/ciromattia/kcc

Starts at $1049

use the enhanced h264-ify to block the av1 stream, av1 takes a lot of cpu

You know what they say, win32 is the most stable linux api.

messenger.com won't allow new sessions on any browsers afaik. https://www.facebook.com/messages works fine

I recently switched to Safari, I'm actually very impressed by how well it works.

Honestly, I kind of support this lack of backward compatibility. So many apps I use from big companies are still Intel based and leaving tons of performance on the table. This will finally force them to change when Rosetta is deprecated.

Open source apps are all native.

Isn't code signing even harder/more expensive on Windows?

"Note: We enabled the availability of iOS 18.7.7 for more devices on April 1, 2026, so users with Automatic Updates turned on can automatically receive important security protections from web attacks called DarkSword. The fixes associated with the DarkSword exploit first shipped in 2025."

https://support.apple.com/en-us/126793

I speculate withholding security updates from iOS 26 compatible devices still on iOS 18 to force people to update didn't work out due to Liquid Glass resistance.

"Note: We enabled the availability of iOS 18.7.7 for more devices on April 1, 2026, so users with Automatic Updates turned on can automatically receive important security protections from web attacks called DarkSword. The fixes associated with the DarkSword exploit first shipped in 2025."

This is highly unusual since iOS 26 compatible devices didn't get iOS 18.7.3-18.7.6

Side tangent: I’m the developer of Kindle Comic Converter. Kindle updates 5.19.2+ have completely broken the sideloaded manga reader with bugs like huge margins, pages being on the wrong side in 2 page landscape mode, no panel view, no % read tracker, and laggy page turns. I’ve documented the problems here and the first report was 60 days ago. https://youtu.be/Eo6K7omlE7g

And I haven’t even touched all the problems with normal sideloaded books like broken embedded/publisher fonts.

And the 11th gen seems to have the final update be 5.19.2 so there is no hope of future fixes.

Kindle settings > help > contact us > email/call if you want to voice complaints.

If anyone is interested, I made a video about my favorite application of the 2D discrete Fourier transform, where it's used to erase rainbows on manga screen tones on color eink Kaleido 3 on Kobo Colour: https://youtu.be/Dw2HTJCGMhw?si=hlhwHv0qB6SoMha9

My Mac Mini M2 sometimes blinks in November months. I've replaced my display cable recently with an HDMI to DVI cable with ferrite cores from monoprice, I'll see if it makes a difference this November.

68 comments: https://news.ycombinator.com/item?id=47678320

22 comments: https://news.ycombinator.com/item?id=47690049

Later discussion: https://news.ycombinator.com/item?id=47690049

Side tangent: I’m the developer of Kindle Comic Converter. Kindle updates 5.19.2+ have completely broken the sideloaded manga reader with bugs like huge margins, pages being on the wrong side in 2 page landscape mode, no panel view, no % read tracker, and laggy page turns. I’ve documented the problems here and the first report was 50 days ago. https://youtu.be/Eo6K7omlE7g

And I haven’t even touched all the problems with normal sideloaded books like broken embedded/publisher fonts.

Kindle settings > help > contact us > email if you want to voice complaints.

This is good stuff, hopefully kindlegen becomes native in macOS 28