Dulux Luminance Contrast Calculator

Contrast Formula:

\[ \text{Contrast} = \frac{L1 - L2}{L1} \times 100 \]

Contrast (%):

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1. What is a Dulux Luminance Contrast Calculator?

Definition: This calculator measures the contrast between two luminance values (L1 and L2) using the Dulux contrast formula.

Purpose: It helps designers and architects evaluate visual contrast between surfaces for accessibility and aesthetic purposes.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ \text{Contrast} = \frac{L1 - L2}{L1} \times 100 \]

Where:

Contrast — Percentage difference between luminances
L1 — Luminance value of the lighter surface
L2 — Luminance value of the darker surface

Explanation: The formula calculates the relative difference between two luminance values as a percentage of the lighter value.

3. Importance of Luminance Contrast

Details: Proper contrast is essential for visual accessibility, safety, and creating visually distinct spaces. The Dulux standard is widely used in architectural design.

4. Using the Calculator

Tips: Enter both luminance values (L1 should be the lighter value). The result shows the contrast percentage.

5. Frequently Asked Questions (FAQ)

Q1: What is considered good contrast?
A: For accessibility, a minimum of 30% contrast is recommended between surfaces.

Q2: How do I measure luminance values?
A: Use a luminance meter or refer to manufacturer specifications for materials.

Q3: Why is L1 in the denominator?
A: Using the lighter value as reference ensures consistent contrast measurement.

Q4: Can I use this for color contrast?
A: This measures luminance contrast only. For full color contrast, additional calculations are needed.

Q5: What's the maximum possible contrast?
A: The theoretical maximum is 100% (when L2 is 0, perfect black).