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ZopfliPNG as baseline
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JPG to PNGffmpeg -y -i image.jpg -vf scale=out_color_matrix=bt709:flags=lanczos+accurate_rnd+bitexact+full_chroma_int+full_chroma_inp image.png
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PNG to ZopfliPNGzopflipng --iterations=15 --filters=01234mepb --lossy_transparent ––prefix=folder/ image.png
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ZopfliPNG to WebPcwebp -lossless -z 9 -m 6 -q 100 -o image.webp image.png
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ZopfliPNG to AVIF (YUV444 8bit)ffmpeg -r 1 -y -hide_banner -loglevel fatal -i image.png -vf scale=out_color_matrix=bt709:flags=lanczos+accurate_rnd+bitexact+full_chroma_int+full_chroma_inp,format=yuv444p -strict -1 image.y4m
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aomenc -v --cpu-used=0 --lossless=1 --full-still-picture-hdr --color-primaries=bt709 --transfer-characteristics=bt709 --matrix-coefficients=bt709 --ivf -o image.ivf image.y4m
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ZopfliPNG to FLIFflif.exe -e -E 100 image.png image.flif
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ZopfliPNG to HEIF (YUV444 8bit)ffmpeg -r 1 -y -hide_banner -loglevel fatal -i image.png -vf scale=out_color_matrix=bt709:flags=lanczos+accurate_rnd+bitexact+full_chroma_int+full_chroma_inp,format=yuv444p -strict -1 image.y4m
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x265 --no-wpp --preset placebo --lossless --colorprim bt709 --transfer bt709 --colormatrix bt709 -o image.hvc image.y4m
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Compression ratio w.r.t ZopfliPNGDiffs
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OriginalZopfliPNGWebPFLIFHEIFAVIFWebPFLIFHEIFAVIFWebP – AVIFFLIF – AVIFHEIF – AVIF
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0081.png73857648655734856832495631845333362271,64%66,79%65,45%68,57%3,07%-1,78%-3,12%
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0091.png98279759014542891641592037256237949572,68%70,48%63,13%64,31%8,37%6,17%-1,17%
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46369666_p0.png1257450123012398441290913794997089814780,03%73,91%77,23%73,01%7,01%0,89%4,21%
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46593390_p0.jpg8508821388537104201889828987463887291375,04%64,69%62,99%62,87%12,18%1,83%0,12%
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46657164_p1.png1299480126133098099089741885143785820477,77%71,15%67,50%68,04%9,73%3,11%-0,54%
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57922687_p0.jpg12647991788072134204410551251120247113048775,06%59,01%62,65%63,22%11,83%-4,21%-0,57%
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60289352_p0.png38245473177036230331020999051949435205228272,50%66,10%61,36%64,60%7,90%1,50%-3,24%
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67142341_p0.jpg326525110878594014287478782344073872484,79%78,90%74,27%66,62%18,17%12,27%7,64%
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a30.png78694645082833567634071332696632293374,46%75,57%72,53%71,63%2,83%3,94%0,89%
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a_cs03.png79112546200331631029664328572628679768,46%64,21%61,85%62,08%6,39%2,13%-0,23%
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DDMC.png1322506112029578052475985079538082049569,67%67,83%71,00%73,24%-3,57%-5,41%-2,24%
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ev_12_01.png75470870398851648251565049132147311673,37%73,25%69,79%67,21%6,16%6,04%2,59%
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EV_KYOU_002.png67141865831251592649528251373747501078,37%75,24%78,04%72,16%6,22%3,08%5,88%
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EV_KYOU_22.png55417453619043466241941242099538015381,06%78,22%78,52%70,90%10,17%7,32%7,62%
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ev_r05_15.png64220359783444243441886337973338805874,01%70,06%63,52%64,91%9,10%5,15%-1,39%
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Haruna.(Kantai.Collection).full.1876087.jpg19442612594438221609820608181843183178335785,42%79,43%71,04%68,74%16,68%10,69%2,31%
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mic012b.png82374280624259941458683958362553175274,35%72,79%72,39%65,95%8,39%6,83%6,43%
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piccg04a.png1285545110878481881679025470728769110073,85%71,27%63,79%62,33%11,52%8,94%1,46%
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piccg31c.png1060234101259370471065944362336960848569,59%65,12%61,56%60,09%9,50%5,03%1,47%
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sac001a.png68556066051148874245934244013944478373,99%69,54%66,64%67,34%6,66%2,20%-0,70%
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SayoriBlep.png89574782024868121658411556273153616383,05%71,21%68,60%65,37%17,68%5,85%3,24%
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The Witcher 3 Wild Hunt - wallpaper 1.jpg11191943117189242469422524302139799193479877,78%72,26%68,65%62,07%15,72%10,19%6,58%
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The Witcher 3 Wild Hunt - wallpaper 2.jpg9793492759842203499419559271816795165336173,74%70,87%65,83%59,91%13,83%10,96%5,92%
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Total24861768284398822168109820071118191909681859423576,23%70,57%67,48%65,38%10,85%5,19%2,10%
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