4 ms·
SSIM being a global metric is not sufficient for many cases. Images with soft gradient tend to be overcompressed. MozJPEG is a good improvement. But its trelli
by vladdanilov 9y ago
SSIM being a global metric is not sufficient for many cases. Images with soft gradient tend to be overcompressed.
MozJPEG is a good improvement. But its trellis cost model causes noticeable blurriness on fine details [1]. Compare with the original [2], Guetzli [3] or my Optimage [4].
So, 'Without (Visual) Quality Loss' is such a stretch.
[1] http://i.imgur.com/6naOWSf.jpg http://i.imgur.com/6naOWSf.jpg
[2] http://i.imgur.com/jny5miJ.jpg http://i.imgur.com/jny5miJ.jpg
[3] http://i.imgur.com/gkO2HsP.jpg http://i.imgur.com/gkO2HsP.jpg
[4] http://i.imgur.com/GEshKJD.jpg http://i.imgur.com/GEshKJD.jpg
- keymone 9y agoi see literally no difference between all of these. i've stared and flipped through them for a minute.
- khedoros1 9y agoThe biggest difference that I see is that the leaf veins are clearer in the original image than in the other three, and that the MozJPEG one did lose some of the finest details.
- woliveirajr 9y agoSeconded. I can only see differences if I change my monitor settings and zoom the image. So, for the original size as shown without changing configurations from the monitor, there is no clear looser/winner.
- mrob 9y agoAll of them cause noticeable quality loss to the orange anthers of the flower in the top left.
- vladdanilov 9y agoConditions applied: 100% zoom and average viewing distance. The real challenge is consistency. Mozjpeg quality is manually tuned here to match the filesize of the rest.