Resizing Quality

[frer8833]

What filter is "Best Quality (Adaptive)" using? Is it High-Quality Bicubic or something unique? Paint.Net's best quality looks more sharp (jaggy) than the High-Quality Bicubic (blurred) which ImageGlass uses (which is also Microsoft's best quality because it uses Microsoft's filters). For example when zooming with IG in on a curve or white dots they look a little more blurred and less peak white compared to Paint.Net.

Edited May 17 by frer8833

[Rick Brewster]

I've improved these for the upcoming 5.0.4. The final/stable release is coming very soon, but you can install a beta right now: https://forums.getpaint.net/topic/122507-paintnet-504-beta-build-8529/

 

"Best Quality (Adaptive)" is being renamed to "Adaptive (Sharp)". It uses different filters depending on the scaling factor, and tends toward the sharp side. The filter is chosen by this code: https://github.com/saucecontrol/PhotoSauce/blob/49a40c08f1571213d9f86dc4f155309a17c9e7e3/src/MagicScaler/Utilities/SettingUtil.cs#L23

 

The new default mode is "Bicubic", which is the Catmull-Rom spline documented here https://imagemagick.org/Usage/filter/ . It is identical to WIC/WPF's "HighQualityCubic" mode (ImageGlass is using GDI+, which is much older, and it may not match WIC/WPF).

 

If you need a guarantee of no sharpening (no ringing artifacts), then avoid Adaptive, Bicubic, and Lanczos. Stick to the other options (including "Bicubic (Smooth)").