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You can also use file -Ib (--mime --brief) to get a mime type:
echo "data:$(file -Ib "$1" | sed 's/ //g;s/;charset=binary$//');base64,$(base64 "$1")"
Printing the dimensions of images with ImageMagick:
identify -format '%w x %h' file.png
great tips. I didn't know file could do mime type like that.
Remarkbox