Insights · How it is measured here · uncalibrated

Fitzpatrick type / Individual Typology Angle from RGB
what a photo can give, and how we take it.

Skin depth (L*), undertone, chroma and colour season, taken from a white-balanced sample. They are described and used for your palette, not forced into a phototype.

Also searched as Fitzpatrick skin type, skin type test and individual typology angle.

Why the textbook version needs more than a photo
uncalibrated
Canthion reports
Photographic equivalent

What we report

Skin depth (L*), undertone, chroma and colour season, taken from a white-balanced sample. They are described and used for your palette, not forced into a phototype.

Fitzpatrick: UV response, six binsIIIIIIIVVVIIV to VI: most of the worldL*b*ITAone skin sampleITA: an angle inL*a*b* spacecalibrated CIE L*a*b* under a known illuminant
Fitzpatrick sorts skin by UV erythema response into six bins. ITA is an angle in the CIE L*a*b* colour space and needs calibrated colorimetry under a known illuminant, which a phone photo under unknown light does not give.

Why not the clinical number itself

ITA requires calibrated CIE L*a*b* colorimetry under a known illuminant. sRGB from a phone under unknown light cannot yield it. Modern computational photography makes it worse: the tone mapping is skin-tone-specific, and it actively destroys colorimetric fidelity. Fitzpatrick is a different thing again. It was designed to predict UV erythema response, not to classify skin colour, and types IV–VI collapse most of the world into three bins.

Sources
What we measure instead

Ratios of near-coplanar frontal distances, angles relative to the interpupillary line, and skin appearance. Each comes with an error bar, and each is placed against a population you choose. Start an analysis or read the methodology.

What the report gives you insteadAll 24 measurements

Same question, different measurement: what the clinical version needs, and what a photograph can give instead.

Gonial anglebony · what a photo can giveRamus : mandibular body ratiobony · what a photo can giveNasofacial angle, and any profile angle taken against a planelateral · what a photo can giveRicketts E-line, Steiner S-line, Holdaway H-linelateral · what a photo can giveOrbital vector / infraorbital rim positionbony · what a photo can giveOgee curve scoreinvented · what a photo can give

What is measured instead

Intercanthal distance : palpebral fissure lengthEyes · tier AAlar base width : intercanthal distanceNose · tier AMouth width : alar base widthLips · tier AUpper : lower vermilion heightLips · tier APhiltrum length : chin heightLower face · tier APalpebral fissure height : lengthEyes · tier A
← Chin projection vs a bony reference plane (zero meridian, etc.)Any absolute measurement in millimetres →

How every bone-level measurement is taken here · methodology · glossary · all 35 insight pages