GoKawiilKCC comic converter adds 2D DFT filtering to sharpen manga on color e-ink
Kindle Comic Converter (KCC), an open-source tool for optimizing comics and manga for e-ink readers, now uses a 2D Discrete Fourier Transform to remove the rainbow effect seen on Kaleido 3 color e-ink screens without blurring the image. The tool also compresses files (e.g., 600MB down to 100MB), fixes faded blacks, and delivers fullscreen pages without margins across Kindle, Kobo, reMarkable and other devices.
GoKawiil's interpretation of the reporting above, not reported fact.
E-ink color displays like Kaleido 3 introduce visible artifacts that standard image processing can't fix without sacrificing sharpness, so a frequency-domain approach could offer manga readers noticeably better clarity on newer color devices. The broader downscaling and black-level correction features suggest the project aims to make large, high-resolution scanned volumes practical to store and read on storage-constrained e-readers.
- KCC uses 2D DFT to remove Kaleido 3 rainbow artifacts without blurring images
- The tool can shrink manga files by roughly 6x while preserving quality for a device's native resolution
- It also corrects faded black levels and enables true fullscreen, margin-free page display
Kindle Paperwhite Signature Edition — This article is all about squeezing the best possible manga image quality onto E-ink screens, and a Paperwhite is a natural target device for KCC's optimized output. Its high-res E-ink display and generous storage make it great for loading up converted manga and comic volumes. Perfect companion for tinkering with KCC's dithering and downscaling options.
See Kindle Paperwhite Signature Edition on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: github.com, 2026-09-28
Published there as: “Show HN: Using 2D DFT, dithering, etc. to maximize eInk manga image quality”
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