Four guided photos and a short sweep over the top of the foot. That's enough to estimate length, width, ball girth and instep girth in a minute or two on the PC.
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Foot
Set up
Put an A4 sheet on a plain, contrasting floor. Stand on it with full weight, heel near the short edge, holding something for balance.
Bare foot, trouser leg rolled above the ankle, good even light.
Someone else holds the phone. The app takes each photo by itself once the phone is at the right angle and still.
Step
…
angle –motion sensor…–
…
Scan
0/4photos
0sweep frames
0 MBtotal size
Reference measurements (optional)
Tape-measured values for this foot. They're saved with the scan so we can check and train the girth estimate.