File: 2024_cvvdp_graph_abstract_720p.mp4 (1.58 MB, 1200x720)
https://files.catbox.moe/auw8e7.txt
Primary goal: Determine compression efficiency between image codecs using a CVVDP score.
Secondary goal: Investigate diminishing returns between Webp and JXL
Currently only works with this specific input file: in.png. Only tested in Ubuntu WSL.
Replace /mnt/c/Users/1337/AppData/Local/Programs/Python/Python313/Scripts/cvvdp.exe with your CVVDP location.
CVVDP SDR display model used: standard_fhd. Scores tested: ~9.0 and ~9.5
My subjective CVVDP interpretation is that ~9.0 = medium quality and ~9.5 = high quality
Use CVVDP with photographic images only as it does poorly with Anime ones.
The display I'm using is a 27 inch 1080p monitor (~82 PPI), viewing distance is ~20 inches.
Created 9-20-2026, using the following dependents and their parameters:
ColorVideoVDP v0.5.7 (released on 08-02-2026) cvvdp -t out.png -r in.png --device cpu -d standard_fhd -m cvvdp
CJPEG version 6b (released on 03-27-1998) cjpeg -baseline -sample 1x1,1x1,1x1 -quality X in.ppm > out.jpg
libwebp v1.6.0 (released on 06-30-2025) cwebp -m 6 -af -q X in.png -o out.webp
libjxl v0.12.0 (released on 07-01-2026) cjxl in.png out.jxl -e 10 --override_bitdepth=10 -q X
libavif v1.4.2 (released on 05-26-2026) avifenc -y 420 -d 10 -s 4 -q X in.png out.avif
ffmpeg version N-125350-g3f6bf150cb-20260629
12 photographic wikipedia images being tested, resized to 50% PNGs, attribution provided in zip:
https://files.catbox.moe/te69tk.zip
https://files.catbox.moe/auw8e7.txt
Example Ubuntu WSL shell output:JPG CVVDP= 9.54 Fsize= 178.7 KB [ cjpeg -baseline -sample 1x1,1x1,1x1 -quality 55 ] Webp CVVDP= 9.54 Fsize= 176.9 KB [ cwebp -m 6 -af -q 78 ] JXL CVVDP= 9.54 Fsize= 133.9 KB [ cjxl -e 10 --override_bitdepth=10 -q 78 ] AVIF CVVDP= 9.55 Fsize= 134.3 KB [ avifenc -y 420 -d 10 -s 4 -q 60] WebP compression efficiency relative to [ JXL: 4.0 % ] & [ AVIF: 4.1 % ]
File: i_bet_the_jews_did_this.webp (128 KB, 990x1080)
Many issues fixed from my first attempt, including making sure intermediate PNG files are correctly encoded as sRGB before being passed off to CVVDP, 10-bit being enabled in cjxl, and various logic errors fixed.
I'm not 100% happy with this as I wanted it to cycle through the quality parameters until a desirable CVVDP score was found, doing this manually takes a while, but it's finally usable right now.
File: 1773979075189791.webm (728 KB, 640x480)
>>1707
Thanks man, I'm planning on mirroring this to Kissu and Reddit soon now that this is usable. I daydream about a Powershell version of this but I'll worry about that next year lol.
Maybe a pro at bash on Kissu/Reddit can help me auto target a CVVDP score, I've read that you need to understand binary search for that and I'm cooked there.
I also made the decision to nerf AVIF and use speed 4 instead of 0. Partly because I feel bad for JXL getting slaughtered by it but mostly because speed 0 is incredibly slow, very few will ever use it.
File: ambush.webp (104 KB, 1080x853)
>>1709
They're live. I didn't mention this place on reddit to avoid spooking them, I'll try that when I go through the 12 images and reach a conclusion on the winners and diminishing returns stuff.
https://www.reddit.com/r/compression/comments/1wmxmwd/v009_image_codec_cvvdp_bash_script/
https://kissu.moe/maho/thread/9196
I think I burned myself out last time by focusing on both the results and the flicker tests at the same time so I've decided to focus on the former first and then the latter.