the rating tool itself - mechanics, scores, what a number means
Penis raters, and how to read one
What a rating tool is actually scoring, how the different ones differ, and how much weight the number deserves.
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Light quality, not just light direction
Diffuse light narrows retake spread; hard light adds shadow that tools read as contrast.
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What a questionnaire does to a photo-based score
Age, goals and other form fields can feed a score or can be pure decoration.
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The whole category on one page: kinds, claims, and how to read them
A single orientation map of how rating tools differ, what each claims, and where the evidence is thin.
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Why your screen settings change how you judge a photo
If you pick the photo to submit on a dim or warm screen, you are choosing with a bad instrument.
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Phone camera settings that make repeat photos comparable
Most of the drift between two photos of the same subject is settings, not the subject.
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Score reliability, from one tool and across several
Reliability is the question under every other question about a score: would you get it again?
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Every variable that sits between the subject and the number
A single reference for the whole chain from lens to file to tool, with which links matter most and which are folklore.