How much can this jpeg be compressed ( smallest) yet retains good image

[LawCounsels]

Hi :

How much can you reduce attached jpeg ( present size 13501 bytes ?

[Shelwien]

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?

[LawCounsels]

Attach Archive

Best good quality lossy , also lossless

[Shelwien]

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

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

- 3q1.jpg is 1173 bytes, but its already too hard to recognize
- 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.

[nikkho]

13163 bytes using FileOptimizer
​12408 bytes using FileOptimizer enabling arith coding.

[Krishty]

13145 bytes using Papa’s Best Optimizer (no arithmetic coding; removing all metadata).

[Jyrki Alakuijala]

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.

Even though such extreme compression is a special use case, JPEG XL does surprisingly well. One of the specialized contestants (img2twit) on the left, JPEG XL on the right at 347 bytes.

[introspec]

(img2twit) on the left, JPEG XL on the right at 347 bytes.

While really appreciating the technical achievement here, I wish she did not look like a bearded man quite so much!

[JamesWasil]

While really appreciating the technical achievement here, I wish she did not look like a bearded man quite so much!

It looks like Chaz Bono wins the internet for having an avatar that is only 347 bytes.

It doesn't look like Mona Lisa at all anymore, but they're still kinda famous? Famous-ish

[necros]

Still acceptable? :
4522 bytes
4187 bytes Arith JPG

[LawCounsels]

Still acceptable? :
4522 bytes
4187 bytes Arith JPG

.... but not great ( in zip archive posted each individual petals look crisp fresh distinct clear )

How was it reduced ?

[Jyrki Alakuijala]

While really appreciating the technical achievement here, I wish she did not look like a bearded man quite so much!

Yes. Practical applications start at 2000 bytes. (One image is worth 1000 WORDs.)

[suryakandau@yahoo.co.id]

Yes. Practical applications start at 2000 bytes. (One image is worth 1000 WORDs.)

Yes I agree

[pklat]

but for twitter challenge, perhaps some other image samples would be more appropriate, *cough* goatse *cough*

[skal]

+ WebP v2 on the right - 254bytes.
​ paper: https://arxiv.org/abs/1812.02831

[jethro]

+ WebP v2 - 254bytes- on the right.
​ paper: https://arxiv.org/abs/1812.02831

just wow.

[jethro]

Attach Archive

Best good quality lossy , also lossless

Tried JPEG XL:


Output siże: 11667 bytes
https://google.github.io/brunsli/

[necros]

Hmm is there any win jpg > jpg xl utility? Or can we make https://google.github.io/brunsli/ for offline use?

[Shelwien]

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.

[Jyrki Alakuijala]

Hmm is there any win jpg > jpg xl utility? Or can we make https://google.github.io/brunsli/ for offline use?

There is no jpeg to jpeg xl conversion available right now. Usually we get 22 % gains with brunsli and 60–65 % with jpeg xl (with a similar manually verified or multi p-norm over the butteraugli field).

Brunsli is specified as a requirement in jpeg xl candidate draft.