PNG-spec
jpeg2png
| PNG-spec | jpeg2png | |
|---|---|---|
| 4 | 2 | |
| 42 | 469 | |
| - | - | |
| 8.9 | 10.0 | |
| 13 days ago | over 3 years ago | |
| HTML | C | |
| GNU General Public License v3.0 or later | GNU General Public License v3.0 only |
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PNG-spec
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Hello, PNG!
Pull requests welcome. :D
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Are IDAT chunks in PNG encoded individually?
There are multiple github issues on the subject where we work on future editions of the PNG spec. (3rd Edition coming soon!)
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Google Chrome Is Already Preparing To Deprecate JPEG-XL (~3x smaller than JPEG, HDR, lossless, alpha, progressive, recompression, animations)
Especially enticing as the PNG file format does allow for additional compression/filter methods and new ones could be added to a PNG 2.0 standard. A small wishlist discussion about that at the W3C's PNG specification Github.
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QOI – The “Quite OK Image Format” for fast, lossless image compression
> But its not like any reader ever supports it fully, hell most readers dont support showing the other images in a png file.
Do you mean APNG? In all fairness, that is not even in the specification although there is discussion to add it. https://github.com/w3c/PNG-spec/issues/26
The one that was specified was MNG but it was a different format and practically no one used it since it was not parsable as a PNG.
jpeg2png
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Google Chrome Is Already Preparing To Deprecate JPEG-XL (~3x smaller than JPEG, HDR, lossless, alpha, progressive, recompression, animations)
That's not necessarily the case with the jpeg2png decoder, but it's been a while since I used it, and I'm not able to test right now. The PNG files will be smaller than with the usual JPEG decoding process, at least.
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Losslessly Optimising Images
This tool optimises blocky JPEGs for a better viewing pleasure: https://github.com/victorvde/jpeg2png
> jpeg2png finds the smoothest possible picture that encodes to the given JPEG file.
What are some alternatives?
qoi - The “Quite OK Image Format” for fast, lossless image compression
ImageOptim-CLI - Make optimisation of images part of your automated build process
fpng - Super fast C++ .PNG writer/reader
shrivel - Command line wrapper utility to shrink a path of images for web based on external tools.
zopfli - Zopfli Compression Algorithm is a compression library programmed in C to perform very good, but slow, deflate or zlib compression.
guetzli - Perceptual JPEG encoder
libjxl - JPEG XL image format reference implementation
Zpng - Better lossless compression than PNG with a simpler algorithm
spdx-spec - The SPDX specification in MarkDown and HTML formats.
oxipng - Multithreaded PNG optimizer written in Rust
specification - Solid Technical Reports