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>"Only a few image-compression standards not using DCT exist today.” I am only aware of JPEG, actually. Can anyone help me? PNG uses deflate and not DCT, TIFF
by fp64 2y ago
>"Only a few image-compression standards not using DCT exist today.”
I am only aware of JPEG, actually. Can anyone help me? PNG uses deflate and not DCT, TIFF supports sort of everything (JPEG is uncommon but possible) but generally no DCT is used, GIF uses some RLE but also not with a DCT, J2K also does not use a DCT, EXR can use Wavelet as well but no DCT I'm aware of.
- Retr0id 2y agoMost of the video-codec-derived formats (HEIC, HEIF) use DCT. Webp also uses DCT (and arguably webp is video-codec-derived too). JPEG-XL also uses DCT. As an aside, while PNG uses deflate for entropy coding, the conceptual analog to DCT in the context of PNG would be its row filters. JPEG's entropy coding isn't all that different to PNG's (aside from the arithmetic coding option which isn't widely used).
- fp64 2y agoYeah, I thought about the video codecs but I wasn't too sure about even the majority there. But here, the quote might be at least much closer to reality. And yes, I am sorry mixing DCT with entropy coding, I've noticed already during writing my comment, but didn't find a better way, and I see you understood what I meant.