GLOSSARY
Vectorscope
The circular scope that displays hue and saturation — the only reliable way to verify skin tone accuracy and color consistency across shots.
Reading a vectorscope
A vectorscope plots hue as angle around the circle and saturation as distance from the center. The six primary and secondary color targets (R, G, B, Y, Cy, Mg) are marked at fixed positions on the outer ring. In DaVinci Resolve, the vectorscope defaults to 75% scale, which means the target boxes represent where fully saturated broadcast-legal colors should land. Switching to 100% scale doubles the displayed range — useful for spotting oversaturation, but the target boxes now represent values beyond broadcast gamut. The skin tone line sits at approximately 11 o'clock (133 degrees on the vectorscope) and represents the hue angle where human skin of any ethnicity naturally falls when correctly white-balanced. Dark skin and light skin occupy the same angle; they differ in luminance (seen on the waveform), not hue direction. If your skin tone trace drifts toward the yellow target, your image has a green shift. Toward the red target, a magenta shift.
Why scopes matter — and when they do not
The vectorscope tells you whether skin tones land on the line, whether colors are broadcast-legal, and whether two shots match in hue distribution. It does not tell you whether the grade looks good. A technically perfect scope reading can produce a sterile, lifeless image. Some of the most effective grades push skin tones deliberately off the 133-degree line — a slight warm shift toward 120 degrees is common in beauty and fashion work. The limitation is real: the vectorscope measures chromaticity, not aesthetics. Use it to verify consistency across a scene (shot A's skin tone trace should overlap shot B's after correction) and to catch problems you cannot see on an uncalibrated monitor. Do not use it to make creative decisions. In DaVinci Resolve, the vectorscope sits in the Scopes panel (Workspace > Scopes > Vectorscope). The Skin Tone Indicator overlay draws a line from center through the 133-degree point — enable it under the scope's gear icon. For multi-camera work, set your primary camera's grade, screenshot the vectorscope, then match the others to the same trace pattern.
Vectorscope FAQ
What is the difference between a waveform and a vectorscope?
A waveform (parade or YRGB) shows luminance and individual channel levels across the horizontal axis of the image. A vectorscope shows only hue and saturation, with no spatial or luminance information. You need both for a complete picture.
Why is the skin tone line at 133 degrees?
Human skin chromaticity clusters around that angle regardless of melanin content because hemoglobin and melanin reflect similar hue ratios. The I-line on Japanese vectorscopes and the skin tone indicator on Resolve vectorscopes both point to the same angular position.
Should my vectorscope trace touch the target boxes?
On the 75% scale, fully saturated broadcast colors should reach the boxes. In practice, real-world footage rarely hits the targets unless you have a pure red, green, or blue object in frame. If your trace extends past the boxes on 75% scale, your colors are oversaturated for broadcast.
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