9 hours ago
(Today, 06:02 AM)Tas_mania Wrote: I investigated this.
First I found my ofn-export-layers was from 2018.
I upgraded to one from 2023 that has the pop-up 'Export Image as PNG'.
I found the PNG file size increased as I reduced 'compression level'.
I checked the built-in 'Export As...'
It did the same so I assume the ofn script uses the Gimp 'Export As'
The frames I used were jpg and about 800kb. By exporting as PNG they went up to 3.2Mb and as high as 4.2Mb.
I'm using Gimp 2.10.38 appimage that may have a bug in it.
Depending on content it is normal to find the PNG bigger than the JPG. In addition if you use high precision images (16-bit or more) the PNG is by default (automatic pixelformat) saved as a 16-bit PNG which doubles its size.
If you use the version with the dialog, the script uses the dialog values for all the layers.