/g/ - Why is WEBP sometimes able to achieve more than 20 - Technology


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Anonymous
10/08/25(Wed)14:27:48 No.106830226

File: test.jpg (1.86 MB, 3008x2000)

Anonymous 10/08/25(Wed)14:27:48 No.106830226

Why is WEBP sometimes able to achieve more than 20-30% lower file size compared to JPG in photographic images?

When aiming for an SS2 of 60/medium quality of picrel, WEBP does this at ~80KB but JPG requires ~200KB which means the former is achieving ~60% lower file size. It doesn't make any sense because VP8 is optimized for cartoons with large flat surfaces with few colors, right?

Or I guess another way to put it is: What makes picrel cursed for JPG?

https://files.catbox.moe/lbcizc.webp

Anonymous
10/08/25(Wed)14:29:13 No.106830242

Anonymous 10/08/25(Wed)14:29:13 No.106830242

File: jpg.jpg (197 KB, 3008x2000)

197 KB JPG

Here's the ~200KB JPG. I was expecting the WEBP was going to knock off 10, maybe 20KB from the file size, not 100+ KB.

Anonymous
10/08/25(Wed)14:40:50 No.106830341

Anonymous 10/08/25(Wed)14:40:50 No.106830341

File: source_jpegli.jpg (180 KB, 3008x2000)

180 KB JPG

Testing ~140KB jpegli encode. This also scored 60 SS2.

Anonymous
10/08/25(Wed)14:43:07 No.106830359

Anonymous 10/08/25(Wed)14:43:07 No.106830359

File: Screenshot_20251008-14422(...).png (328 KB, 720x1480)

328 KB PNG

It failed...

WTF, 4chan doesn't support jpegli images?

Anonymous
10/08/25(Wed)17:25:45 No.106831625

Anonymous 10/08/25(Wed)17:25:45 No.106831625

File: 1759948068740512a.png (279 KB, 3008x2000)

279 KB PNG

lossy formats are obsolete, use lossless

Anonymous
10/08/25(Wed)18:12:33 No.106831951

Anonymous 10/08/25(Wed)18:12:33 No.106831951

>>106831625
I got a negative SS2 score with this...

Anonymous
10/08/25(Wed)18:35:41 No.106832146

Anonymous 10/08/25(Wed)18:35:41 No.106832146

>>106831951
lower is better, like par in bowling

Anonymous
10/08/25(Wed)21:33:40 No.106833496

Anonymous 10/08/25(Wed)21:33:40 No.106833496

File: racer_550px.jpg (12 KB, 550x366)

12 KB JPG

>>106830226

you can see this has same value as pics above unless you are printing

whats the quality score

Anonymous
10/08/25(Wed)21:38:42 No.106833532

Anonymous 10/08/25(Wed)21:38:42 No.106833532

>>106833496
-100

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