because some images were small (< 10 colours?!?) had to use ‘1x1+0+0<‘. Without ‘1x1’, images less than 10px wide would have a 10 pixel border added!

gm montage -verbose -tile 192x1080 +frame +shadow +label \
-geometry ‘1x1+0+0<‘ @first_207360jpgs.txt hdframe.png

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