Microscope test images
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image size is about 2 mm by 1 mm.
(Mars rock reflectance ~10%, range=5-35%.)
(Image reflectance range is 0.05 to 0.8.)
The adhesive reflectance is ~70%, but as seen here (with shadowing)
it is only ~40-50%. In the absence of shadowing the adhesive is white.
Images from trench soil
Size < 100 microns, so only one depth-of-field needed.