1. What is Hue Angle?

The hue angle is a measurement used in color science to determine the dominant wavelength of a color in the CIELAB color space. For glasses and lens tinting, it helps quantify the precise color characteristics of materials.

2. How Does the Calculator Work?

The calculator uses the hue angle formula:

Where:

• \( a \) — A component in CIELAB color space
• \( b \) — B component in CIELAB color space
• \( \arctan2 \) — Two-argument arctangent function

Explanation: The function calculates the angle in degrees between the positive a-axis and the point (a, b) in the color plane, providing a quantitative measure of hue.

3. Importance of Hue Calculation

Details: Accurate hue angle calculation is crucial for precise color matching in lens manufacturing, quality control of tinted glasses, and ensuring consistent color characteristics across production batches.

4. Using the Calculator

Tips: Enter the a and b components from CIELAB color measurements. Both values can be positive or negative, representing different color directions in the color space.

5. Frequently Asked Questions (FAQ)

Q1: What is the range of hue angle values?
A: Hue angle values range from 0° to 360°, representing the full color circle in the CIELAB color space.

Q2: How are a and b components measured?
A: A and b components are typically measured using colorimeters or spectrophotometers that provide CIELAB color coordinates.

Q3: What does a hue angle of 0° represent?
A: A hue angle of 0° represents the red/magenta direction in the CIELAB color space.

Q4: Why is hue angle important for glasses?
A: Hue angle helps ensure color consistency in tinted lenses, matches specific color requirements, and maintains quality standards in optical products.

Q5: Can this calculator handle negative a/b values?
A: Yes, the calculator properly handles all combinations of positive and negative a and b values, producing correct hue angles in all quadrants.