Hi :
How much can you reduce attached jpeg ( present size 13501 bytes ?
Hi :
How much can you reduce attached jpeg ( present size 13501 bytes ?
Last edited by LawCounsels; 14th November 2019 at 01:22.
1. Please reupload your image in an archive.
As it is, the size of attached file is 13501, while the size of file saved by chrome is 5589, so it gets confusing.
2. Are you asking about lossy (reduce size of jpeg file) or lossless (get a smaller archive from which the same jpeg can be extracted) or both?
Krishty (15th November 2019)
Attach Archive
Best good quality lossy , also lossless
Well, in the end its up to what you'd consider acceptable.
I tested:
1) jpegtran -copy none / progressive / arithmetic (your file contains some metainfo)
2) guetzli (2*)
3) imagemagick re-encoding (3*)
4) paq8px = the best lossless jpeg recompressor
- 3q1.jpg is 1173 bytes, but its already too hard to recognizeCode:13,501 shopping.jpg 12,696 shopping_a.jpg // jpegtran -copy none -arithmetic 12,521 shopping_pa.jpg // jpegtran -copy none -progressive -arithmetic 11,073 shopping.jpg.paq8px183 // -7 9,065 2.jpg // guetzli_windows_x86-64.exe --quality 0 --nomemlimit shopping.jpg 2.jpg 8,674 2_a.jpg 8,490 2_pa.jpg 7,738 2.jpg.paq8px183 3,348 3q10.jpg // convert -quality 10 shopping.jpg 3.jpg 2,698 3q10.jpg.paq8px183
- 3q46.jpg is 10674 bytes, so no point in going higher
Also there's this: https://stackoverflow.com/questions/...ding-challenge
but it doesn't properly apply to pictures that start as jpeg, because jpeg artifacts hurt compression of other algorithms.
13163 bytes using FileOptimizer
12408 bytes using FileOptimizer enabling arith coding.
13145 bytes using Papa’s Best Optimizer (no arithmetic coding; removing all metadata).
JamesWasil (16th November 2019)
Still acceptable? :
4522 bytes
4187 bytes Arith JPG
but for twitter challenge, perhaps some other image samples would be more appropriate, *cough* goatse *cough*
+ WebP v2 on the right - 254bytes.
paper: https://arxiv.org/abs/1812.02831
Last edited by skal; 19th November 2019 at 09:50.
Tried JPEG XL:
Output siże: 11667 bytes
https://google.github.io/brunsli/
Hmm is there any win jpg > jpg xl utility? Or can we make https://google.github.io/brunsli/ for offline use?
Its not quite like what they say.
Brunsli is google's jpeg recompressor: https://github.com/google/brunsli
It may be considered for jpeg XL integration, but atm brunsli is a standalone codec.