What Is Upper Forehead Slope in FaceIQ Labs' Harmony Analysis?
Upper Forehead Slope is a FaceIQ Labs Harmony measurement taken on the side-view photo. It is the angle hairline → glabella → forehead landmark, the difference in direction between two lines from the brow prominence to the upper forehead. A lower value means the two directions nearly align; a higher value means they diverge more.
Key facts
- Calculated as the angle hairline → glabella → forehead landmark
- Taken from the side-view photo; listed in the FaceIQ Labs Harmony guides under Side view, Upper Third
- One of the 70+ facial ratios and angles in FaceIQ Labs' Harmony pillar
- Lower value: the hairline and forehead landmark lie in nearly the same direction from the glabella
- Higher value: the two directions diverge more
- It is an angle between two forehead rays, not an angle against horizontal
- The hairline must be visible in the photo
- FaceIQ Labs describes it as a FaceIQ photographic construction; the cited work does not validate this exact landmark formula or its scoring range
- Side photos are standardized to the Frankfort horizontal plane during landmarking
- The guide's 2° and 8° example values are not target ranges
What is Upper Forehead Slope in FaceIQ Labs' Harmony analysis?
Upper Forehead Slope is a side-view measurement in the Harmony pillar of FaceIQ Labs' facial analysis. It is the angle hairline → glabella → forehead landmark, described as the difference in direction between two lines running from the brow prominence to the upper forehead. FaceIQ Labs files it under Harmony, side view, upper third.
How does FaceIQ Labs calculate Upper Forehead Slope?
FaceIQ Labs calculates Upper Forehead Slope as the angle hairline → glabella → forehead landmark on a side-view photo. It is an angle between two forehead rays that start at the glabella, not an angle measured against horizontal. The hairline must be visible in the photo.
What does a lower or higher Upper Forehead Slope value mean?
In FaceIQ Labs' Harmony analysis, a lower Upper Forehead Slope means the hairline and the forehead landmark lie in nearly the same direction from the glabella. A higher value means the two directions diverge more. The guide gives no target range for this measurement, so neither lower nor higher is labeled as ideal.
Why does FaceIQ Labs measure the contour above the brow separately?
FaceIQ Labs' Upper Forehead Slope describes the contour above the brow separately from the forehead's overall tilt. A straight forehead can be inclined while the two measured directions remain close together, so the measurement captures something different from overall forehead inclination rather than repeating it.
Which photo does FaceIQ Labs use for Upper Forehead Slope?
FaceIQ Labs measures Upper Forehead Slope on the side-view photo, and the hairline must be visible. Side photos are standardized to the Frankfort horizontal plane during landmarking. For accuracy, FaceIQ Labs recommends photos taken from six feet away with the back camera at 2x zoom, at eye level, in even lighting, with a neutral expression.
What does a worked example of Upper Forehead Slope look like?
In a FaceIQ Labs worked example for Upper Forehead Slope, two rays only 2° apart indicate a small contour difference. If they separate to 8°, the measured difference grows even if the head is not rotated. These example values explain the calculation; they are not a target range and are not measurements of the guide's schematic.
Is the Upper Forehead Slope measurement clinically validated?
FaceIQ Labs states that the cited work does not validate this exact landmark formula or its scoring range. It describes Upper Forehead Slope as a FaceIQ photographic construction, with clinical profile analysis as context. The one cited source, Farkas et al. (2005), documents facial dimension variation across sampled populations and does not establish an attractiveness score. FaceIQ Labs also says its score weights and reference ranges are model settings.
How does Upper Forehead Slope fit into the Harmony score?
Upper Forehead Slope is one of the 70+ facial ratios and angles in the Harmony pillar of FaceIQ Labs. Harmony scores faces from 0 to 10 using ideal ranges adjusted for gender and ethnicity, and is weighted roughly 60% from the front photo and 40% from the side photo.
What do nasion, subnasale, pogonion and Frankfort mean in these guides?
In FaceIQ Labs' Harmony measurement guides, nasion means the nasal root, subnasale the nose base, and pogonion the most forward chin point. Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark. FaceIQ Labs standardizes side photos to the Frankfort horizontal plane during landmarking, which applies to side-view measurements such as Upper Forehead Slope.
Which FaceIQ Labs measurements are related to Upper Forehead Slope?
FaceIQ Labs' help center lists three guides in the same region as Upper Forehead Slope: Browridge Inclination Angle, Nasofrontal Angle and Brow Bossing Angle. Each is a separate Harmony measurement with its own guide page; this page covers only Upper Forehead Slope.
Frequently asked questions
Is Upper Forehead Slope measured against horizontal?
No. FaceIQ Labs measures Upper Forehead Slope as the angle between two rays from the glabella, one to the hairline and one to a forehead landmark, not against a horizontal line.
Is the Upper Forehead Slope measurement clinically validated?
FaceIQ Labs describes it as its own photographic construction. The cited research, Farkas et al. (2005), gives background on facial dimension variation but does not validate this exact landmark formula or its scoring range.
What does a low versus high Upper Forehead Slope value mean?
A lower value means the hairline and forehead landmark lie in nearly the same direction from the glabella. A higher value means the two directions diverge more, indicating a larger contour difference above the brow.
Does the hairline need to be visible?
Yes. FaceIQ Labs states that the hairline must be visible for Upper Forehead Slope to be measured.
Are the 2° and 8° values in the example target ranges?
No. FaceIQ Labs gives the example values only to explain how the calculation works; they are not a target range.
What does Frankfort mean in FaceIQ Labs' guides?
In FaceIQ Labs' guides, Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark. Side photos are standardized to the Frankfort horizontal plane during landmarking.