Image Magick

So far useless

Rescale the gray to min/max

-normalize pragmatic

pragmatic one out of range pixels will be ignored

#rescale the gray to min/max version 1
for image in *.tif; do magick "$image"  -normalize  "normalize_${image}"; done

-auto-level idealistic

idealistic, single saturated pixels will be accounted for, good for mathematically generated images

# rescale to min/max version 2
for image in [^n]*.tif; do magick "$image"  -auto-level  "auto-level_${image}"; done