Swapping red and blue fixes the file:
convert a.png -separate -swap 0,2 -combine b.png
or for all files in dir, placing results in subdir
for i in *.png; do convert “$i” -separate -swap 0,2 -combine “subdir/$i”; done
Swapping red and blue fixes the file:
convert a.png -separate -swap 0,2 -combine b.png
or for all files in dir, placing results in subdir
for i in *.png; do convert “$i” -separate -swap 0,2 -combine “subdir/$i”; done