seam_carver

Isn't the file overwritten every update?

I still use the old version of Keynote for this reason.

Oh is that why I keep getting those ai emails about the project I posted earlier?

I had no prior kindle jailbreak experience.

I just went to the kindle modding website, followed the instructions, and jailbroke in like 5 minutes.

Because Apple still sells 256 gb base models like the m6 Mac mini

Sonoma is out of security updates so I went to sequoia.

It's pretty much the same as Sonoma besides the apple intelligence which is optional.

iOS 27 fixed some bugs but added more. Sigh.

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.