JPEG Deblocking / Dithering

[Xn User]

Hi Pierre )

I'm continue theme about queality reading JPEG ( not JPEG 2000 / JPEG XL / JPEG Li formats ) , previously I offered you add dithering in JPEG format , you add Floyd-Steinberg and Ordered, this increased JPEG reading , but quality me not satisfied and I intend to achieve quality whitch as want , I'm offer add to XnViewMP / XnConvert two alhorytms Stucki , Blue Noise and Jarvis , please , add this alhorytms because this closest to quality whitch I want )

Stucki alhorytm Github https://github.com/esimov/dithergo
Blue noise alhorytm Github https://github.com/mblode/blue-noise-rust
Blue noise alhorytm Githb 2 https://github.com/laszlokorte/blue-noise
Jarvis alhorytms Github https://github.com/mikewolak/pngditherlib

[Xn User]

I won't leave you alone on the issue in this questions , and will be do all what recive high quality dithering.
You can compare floyd steinberg and jarvis quality , I'm addressing the forum members , please , help me increase quality reading JPEG in XnViewMP , I'm addresing to Pierre from 2024 year , but I can not recive Jarvis as maximum quality dithering

[Xn User]

this add to previous post

[Xn User]

where to look ?
pay attention to the area along which the red stripe is drawn.. if you compare all methods and Jarvis ro Sierra 2 or Sierra 3 , you can see waht this alhorytms give maximum quality dithering and in this alhorytms absent zone unpainted or partially unpainted , noise is distributed very evenly , in Floyd-Steinberg and Ordered this work bad and noise is distributed very not evenly and available zones with rude colors , I specially chose a small number of colors to show this as can effort

[Xn User]

I think what need add alhorytms Jarvis , Sierra 2 and Sierra 3 in dither for JPEG files in XnViewMP
and need this add as soon as possible
input.jpg this is original for compare as work alhorytms and compare quality alhorytms
here blocking zones
for test zones.png - is what need compare after make Jarvis alhorytm , this zones must increase quality dithering and must become more smothing

[Xn User]

For compare
acdsee.png - this convert from JPEG to PNG in ACDSee Pro 6.0
xnviewmp.png - this convert from JPEG to PNG in XnViewMP latest version

[Xn User]

In XnViewMP alhorytms here only Ordered and Floyd-Steinberg , I'm remember what I oferred Stucki , but now when I learning quality all alhorytms , I understanded what Stucki will not very good idea , because this alhorytm slightly smoothed Floyd-Steinberg , and this quality low and need very increase quality dithering in JPEG files , I was wrong before