2026-03-25 20:33 UTC
@bosak the image height is 750px. The main problem with this one is that i forgot to check the engraved shading in the sky for scaling artefacts. Almost-parallel lines a few pixels wide cause emergent patterns when reduced; the usual workarounds are to use a different interpolation method when downsizing, or to blur first and then sharpen again afterwards.
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@bosak@flx.masto.host 2026-03-26 02:03
@barefootliam I tune my scans for Mastodon by downsampling png to a jpg that's 4096 in the long dimension, and the detail comes through pretty well. If I have a bunch of png files to convert, I call up Ubuntu under Win11 (the only thing I use Ubuntu for) and run for f in *.png; do echo $f; magick -quiet "$f" -resize 4096x4096 -quality 90 "$(basename "$f" .png)_4096.jpg"; done Imagemagick does a great job with this.