Color Blindness Check
Approximate RGB shifts for protanopia, deuteranopia, and tritanopia (Brettel-style simplification).
Inputs
Results
Protan B
50
Protan R151
Protan G149
Deutan R129
Deutan G129
Deutan B50
Tritan R220
Tritan G60
Tritan B60
Rel. luminance93.294
How to Use This Calculator
- Enter an RGB color value (0-255 for each channel) you want to test.
- Review the simulated RGB values for protanopia, deuteranopia, and tritanopia.
- Compare the shifted values to your original to check if your design colors are distinguishable for color-blind users.
- Use the relative luminance value to assess WCAG contrast compliance.
How the result changes with Blue 0–255
| Blue 0–255 | Protan B |
|---|---|
| 26 | 26 |
| 89 | 89 |
| 166 | 166 |
| 230 | 230 |
What each input means
- Red 0–255
- sRGB red channel.
- Green 0–255
- sRGB green channel.
- Blue 0–255
- sRGB blue channel.
How this is calculated
Worked example, using the default values
- Identify Input ParametersRed 0–255 = 220, Green 0–255 = 60, Blue 0–255 = 50 = 3 input(s) provided
- Calculate Protan BProtan B = b50 = 50
- Calculate Protan RProtan R = 0.56667 * r + 0.43333 * g151 = 151
- Calculate Protan GProtan G = 0.55833 * r + 0.44167 * g149 = 149
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.
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