10 hours ago
(04-27-2025, 06:10 PM)rich2005 Wrote:(04-27-2025, 04:45 PM)Gene Wrote: Probably the quality of interpolation in the 'Scale Image' function changed from 'Linear' to 'Cubic' or '**Halo' one. Recently, my GIMP 2.10.10 started doing that on its own after a recent upgrade to Windows 10, Ver, 22H2, Built 19045.5737 for unknown reason forcing to take a look at the issue. Unfortunately, after the interpolation is changed manually to 'Linear' and GIMP is closed, 'Cubic' comes back as a default after restarting GIMP. It has to be changed manually every time after closing GIMP.
You set the default interpolation in Edit -> Preferences
If it returns to Cubic , then use the Save tool Options Now after choosing the interpolation option.
...followed by the Save Now option in the Input Devices section (A strange requirement but necessary)
Yes, doing Edit > Preferences > Tool Options > Scaling > Linear > OK did save 'Linear' as a default interpolation method for scaling images resolving both issues of speeding up scaling and having that permanently. That is a compromise between the speed and degree of retaining original quality of the image. Other methods to retain a higher quality, e.g. 'Cubic' take a lot more time than 'Linear' making scaling much slower.