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picrel was made with
magick montage -density 300 -tile 3x0 -geometry "1000x1000>+0+0" * resize3.png
* means grab all the files in the current folder
remove the > in -geometry to make the small files scaled up
the 0 in -tile 3x0 is a wildcard, the program makes the collage the appropriate length
The way I've installed it, the command starts as "magick montage", but for you it might "convert montage" or simply "montage".
