White Point D65 Calibration Check
Compare measured physical xy white to nominal D65 (.3127,.3290) in CIE 1960 uv using caller tolerance; not CIE1976 u′v′, full display calibration, spectral white equivalence or a color-difference of arbitrary XYZ tristimulus magnitudes.
Description
A nominal D65 white check can compare physical xy coordinates in CIE 1960 uv.
A nominal D65 white check can compare physical xy coordinates in CIE 1960 uv. Chromaticity proximity is one calibration measurement.1
Enter two coordinates strictly between 0 and 1 with x+y≤1 and nonnegative tolerance. Compare with nominal xy[0.3127,0.3290]; return distance and inclusive gate.
When to use White Point D65 Calibration Check
Use White Point D65 Calibration Check when you need to evaluate the supplied records under the calculation and evidence rules below. No CIE 1976 u′v′, spectral white equivalence or full display calibration is performed.
Prepare colors in the stated color space and scale. Use encoded RGB fractions, linear RGB, Lab, xy, byte values or ink percentages exactly as requested; supply caller tolerances and reference conditions.
How to use White Point D65 Calibration Check and understand its results
- Prepare colors in the stated color space and scale. Use encoded RGB fractions, linear RGB, Lab, xy, byte values or ink percentages exactly as requested; supply caller tolerances and reference conditions.
- Enter measuredWhiteXy, callerMaximumCie1960UvDistance using the field table and calculation rules, then run the tool.
- Read cie1960UvDistanceFromNominalD65, withinCallerD65WhiteTolerance. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| measuredWhiteXy | Measured white xy | list of number | Required |
| callerMaximumCie1960UvDistance | Caller maximum cie1960 uv distance | number | Required |
Enter two coordinates strictly between 0 and 1 with x+y≤1 and nonnegative tolerance. Compare with nominal xy[0.3127,0.3290]; return distance and inclusive gate.
u=4x/(−2x+12y+3); v=6y/(−2x+12y+3); distance=hypot(Δu,Δv) Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| cie1960UvDistanceFromNominalD65 | Cie1960 uv distance from nominal d65 | number |
| withinCallerD65WhiteTolerance | Within caller d65 white tolerance | boolean |
{
"input": {
"measuredWhiteXy": [
0.3127,
0.329
],
"callerMaximumCie1960UvDistance": 0.001
},
"output": {
"cie1960UvDistanceFromNominalD65": 0,
"withinCallerD65WhiteTolerance": true
}
}Limitations and assumptions
No CIE 1976 u′v′, spectral white equivalence or full display calibration is performed.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Numeric lists are limited to 10,000 entries; string lists to 128 strings of at most 128 characters each. The rules above may impose smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors. A successfully returned false flag is an evaluated outcome; its meaning is explained above.
Alternative or Complementary methods
Use Planckian Track Duv Approximation: A local Planckian displacement projects measured chromaticity onto a normal at a chosen reference temperature. It is an approximation to Duv near that reference. For a complementary task, use CCT From xy Chromaticity Approx: McCamy approximate CCT uses an xy polynomial near a bounded domain. Not every chromaticity has a meaningful correlated temperature.
References
-
White Point D65 Calibration Check — tool.io
Similar or alternative tools
- Planckian Track Duv Approximation
A local Planckian displacement projects measured chromaticity onto a normal at a chosen reference temperature. It is an approximation to Duv near that reference.
- CCT From xy Chromaticity Approx
McCamy approximate CCT uses an xy polynomial near a bounded domain. Not every chromaticity has a meaningful correlated temperature.