Introduce Guetzli

IntroduceGuetzli

Guetzli [gutsli]

Google C++ JPEG 2016 10 22 2 0 1 7 3 Google Research Blog

Apache Licnese 2.0

libjpeg

20 ~ 30%

libjpeg, ImageMagick JPEG .

JPEGand

https://ko.wikipedia.org/wiki/WebP

https://ko.wikipedia.org/wiki/JPEG

Original libjpeg Guetzli

https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html

Original libjpeg Guetzli

https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html

Lets TEST

$ brew install guetzli

How to install on macOS

$ guetzli [--quality Q] [--verbose] original.png output.jpg

How to use

$ guetzli --quality 84 --verbose original.jpeg guetzli.jpeg

Quality is only allowed to be greater than 84

2.2MB 952KB

Original JPEGmini Guetzli

706KB

Q90

56% 67%

GuetzliQ95

925KB57%

2.2MB 952KB

Original JPEGmini Guetzli

706KB

Q90

56% 67%

GuetzliQ95

925KB57%

2.2MB 952KB

Original JPEGmini Guetzli

706KB

Q90

56% 67%

GuetzliQ95

925KB57%

2.9MB 1.2MB

Original JPEGmini Guetzli

897KB

Q90

58% 69%

GuetzliQ95

1.2MB58%

2.9MB 1.2MB

Original JPEGmini Guetzli

897KB

Q90

58% 69%

GuetzliQ95

1.2MB58%

2.9MB 1.2MB

Original JPEGmini Guetzli

897KB

Q90

58% 69%

GuetzliQ95

1.2MB58%

JPEGmini Guetzli Q95

But

https://davidwalsh.name/jpeg-compression-guetzli

https://davidwalsh.name/jpeg-compression-guetzli

Why is it so slow?

JPEG I SO ITU-T 1992 .

Joint Photographic Experts Group

https://en.wikipedia.org/wiki/JPEG

http://www.fileformat.info/mirror/egff/ch09_06.htm

Multi-stage Compression Process

http://www.fileformat.info/mirror/egff/ch09_06.htm

1.

Multi-stage Compression Process

RED

GREEN

BLUE

Y - Luminance

Cb - Blueness

Cr - Redness

http://www.fileformat.info/mirror/egff/ch09_06.htm

2.

Multi-stage Compression Process

Y Cb Cr

4:4:4

4:2:2

4:1:1

Y Cb Cr

Y

Y

Cb Cr

Cb

Cr

4:4:4

4:2:2

4:1:1

http://www.fileformat.info/mirror/egff/ch09_06.htm

3.

Multi-stage Compression Process

http://www.fileformat.info/mirror/egff/ch09_06.htm

4.

Multi-stage Compression Process

http://www.fileformat.info/mirror/egff/ch09_06.htm

5.

Multi-stage Compression Process

https://www.youtube.com/watch?v=qys8R_3H-kc

Guetzli specifically targets the quantization stage in which the more visual quality loss is introduced,

the smaller the resulting file.

Psychovisual modeling of JPEG's format

https://github.com/google/butteraugli

Psychovisual modeling of JPEG's format

https://github.com/google/butteraugli

Search Algorithms

Psychovisual modeling of JPEG's format

Guetzlis psychovisual model +(butteraugli)

https://github.com/google/butteraugli

Search Algorithms

Psychovisual modeling of JPEG's format

Guetzlis psychovisual model +(butteraugli)

https://github.com/google/butteraugli

Very slow

Search Algorithms

Psychovisual modeling of JPEG's format

Guetzlis psychovisual model +(butteraugli)

https://github.com/google/butteraugli

Very slow

But image can get high quality and smaller file sizes

We think this makes the slower compression a worthy tradeoff

Ideas

Background

Background

Background

Background

Background

Background

Background

Overwrite

,

Guetzli 1 300MB

http://qiita.com/yohhoy/items/406af27d4415c7bb6346

http://co.bsnws.net/article/206

http://japanese.engadget.com/2017/03/17/google-jpeg-guetzli-35/

http://qiita.com/bezeklik/items/95449c9dd79c70bf8771

()

https://ko.wikipedia.org/wiki/JPEG

https://research.googleblog.com/2017/03/announcing-guetzli-new-open-source-jpeg.html

https://en.wikipedia.org/wiki/JPEG

http://www.fileformat.info/mirror/egff/ch09_06.htm

https://medium.freecodecamp.com/how-jpg-works-a4dbd2316f35

.