Insights · Skin · Skin
Tone uniformity across regions
Standard deviation of mean lightness across facial regions.
Confidence
Skin · lighting-dependent
Unit
σL*
Region
all regions
CI floor
—
canvas pixel analysis in CIE L*a*b* — see methodology
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Illustration · on your scan the same lines are drawn on your own photo
How to read it
Below the mean
Near the mean
Above the mean
Caveat
Uneven lighting is indistinguishable from uneven tone in a single photo.
Why every value has an error bar
Every value Canthion reports carries a 1σ uncertainty propagated from MediaPipe Face Mesh's published accuracy (3.96% of inter-ocular distance mean absolute error per landmark, Kartynnik 2019). For a typical 300 px inter-pupil photo that is ≈12 px per landmark, which is why small ratios and angles get wide intervals. A number without an interval is a number pretending to be more precise than it is.
Related: how bone-level measurements are taken from a photo · methodology · all insights