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!! Bug 2 Error !! Invalid Chroma Sampling
Posted: Fri Oct 08, 2021 4:24 am
by jxl
In the AVIF format. 444 422 420. The file size after the conversion is same. The converted MD5 is same. The picture used to test is 444 png.
- AVIF.png (11.1 KiB) Viewed 4057 times
Thanks!
jpeg XL also has an error.
quality below 9. Bytes will be larger. You can test with 012345678 quality levels. They are all much larger than 9.
- JXL.png (5.45 KiB) Viewed 4103 times
There's something wrong with my post. The contents of the first floor disappeared. Now I edit it again. Please re-read my edited post. Thank you very much for noticing my problem. Dear developer.
Re: !! Bug 2 Error !! Invalid Chroma Sampling
Posted: Fri Oct 08, 2021 9:04 am
by xnview
what do you means? Compression (effort) with 0 will create larger file
Re: !! Bug 2 Error !! Invalid Chroma Sampling
Posted: Fri Oct 08, 2021 1:35 pm
by jxl
xnview wrote: Fri Oct 08, 2021 9:04 am
what do you means? Compression (effort) with 0 will create larger file
I mean: in jpeg XL. Set the quality to 9. Get the smallest file at this point. Set the quality to 8. Get a larger file at this point. Much larger than 9. The quality 0 to 8 file sizes are the same. file MD5 is the same for 0 to 8.
Another problem for me: in AVIF. Chromose sampling is an invalid setting. Whether set to 4:4:4 or 4:2:2 or 4:2:0. You will get files of the same size. The MD5 of the three result files is the same. Normal behavior is: 4:2:0 is smaller than 4:4:4 file.
Re: !! Bug 2 Error !! Invalid Chroma Sampling
Posted: Thu Oct 21, 2021 6:14 am
by xnview
jxl wrote: Fri Oct 08, 2021 1:35 pm
xnview wrote: Fri Oct 08, 2021 9:04 am
what do you means? Compression (effort) with 0 will create larger file
I mean: in jpeg XL. Set the quality to 9. Get the smallest file at this point. Set the quality to 8. Get a larger file at this point. Much larger than 9. The quality 0 to 8 file sizes are the same. file MD5 is the same for 0 to 8.
I've tried and can't reproduce, same with cjxl? which image file do you use?