Tritanopia Color Shift Calculator

Enter red, green, and blue channel values (0–255) to simulate how the color appears to someone with tritanopia and see the shifted hex, luminance, and WCAG contrast ratio.

Created by Luis GonzalezLast updated: May 9, 2026

How to Use This Calculator

1
Enter Red Value
Input the Red channel value of your original RGB color, ranging from 0 to 255.
2
Enter Green Value
Input the Green channel value of your original RGB color, ranging from 0 to 255.
3
Enter Blue Value
Input the Blue channel value of your original RGB color, ranging from 0 to 255.
4
View Shifted Color
The calculator will display the simulated color as perceived by someone with tritanopia, along with its new RGB values, hex code, and luminance.

Example Calculation

A web designer wants to see how a vibrant sky blue (#28B4E6, or 40, 180, 230) appears to users with tritanopia.

Red (0–255)

Green (0–255)

180

Blue (0–255)

230

Results

#2FD0CE

Tips

Test Key UI Elements for Accessibility

Apply this simulation to critical user interface elements like buttons, alerts, and navigation links. Ensure that color-coded information remains distinguishable even after the tritanopia shift, preventing accessibility barriers for users.

Prioritize Contrast Over Hue for Information

When conveying information, rely more on strong luminance contrast than on specific color hues. Tritanopia primarily affects the perception of blue and yellow, making contrast a more reliable visual cue for all users, including those with color vision deficiencies.

Use Text Labels or Icons as Redundancy

Never rely solely on color to convey important information. Always provide alternative visual cues such as text labels, icons, or patterns. This redundancy ensures that the message is understood by individuals with tritanopia and other forms of color blindness.

Designing for Inclusivity: Simulating Tritanopia Color Perception

The Tritanopia Color Shift Calculator offers a critical tool for designers, artists, and developers aiming to create accessible visual experiences. By simulating how any given RGB color appears to someone with tritanopia (blue-yellow color blindness), the calculator provides an invaluable perspective for ensuring content is perceivable by all users. This simulation includes the shifted color swatch, its new hex values, and luminance, helping creators understand the impact on visual clarity. Given that approximately 1 in 100,000 people experience tritanopia, designing with this condition in mind is a vital step towards universal usability in 2025.

Designing for Color Vision Deficiency Accessibility

Designing for color vision deficiency accessibility means intentionally creating visual content that remains clear and informative regardless of how colors are perceived. For conditions like tritanopia, where blue and yellow hues are confused, it's essential to avoid relying solely on these colors to convey meaning or differentiate elements. Instead, designers should use strong luminance contrast, incorporate distinct textures or patterns, and always provide redundant cues like text labels or icons. This proactive approach ensures that critical information, navigational elements, and branding remain effective for a broader audience, fostering an inclusive user experience that benefits everyone.

The Algorithm Behind Tritanopia Color Simulation

The Tritanopia Color Shift Calculator uses a specific algorithm to transform standard RGB values into their simulated tritanopic equivalents. This transformation is based on established color vision deficiency models that approximate how the absence or deficiency of blue cone cells affects color perception. The core logic involves a linear transformation matrix applied to the original Red, Green, and Blue values.

The simplified transformations for shifted Red (sR), Green (sG), and Blue (sB) can be represented as:

sR = 0.95 × Original Red + 0.05 × Original Green
sG = 0.433 × Original Green + 0.567 × Original Blue
sB = 0.475 × Original Green + 0.525 × Original Blue

These values are then clamped to the 0-255 range. The resulting sRGB values represent the color as it would be perceived by an individual with tritanopia, allowing designers to assess potential visual challenges.

💡 After simulating the color shift, use a Relative Luminance Contrast Calculator to check if the new color combination still meets WCAG accessibility standards for text and interactive elements.

Seeing Blue-Yellow Shift: A Design Example

Consider a designer working with a vibrant sky blue, represented by RGB values (40, 180, 230), which corresponds to the hex code #28B4E6. They use the calculator to simulate its appearance with tritanopia.

Input Original RGB: Enter Red: 40, Green: 180, Blue: 230.
Calculate Shifted Red: sR = 0.95 × 40 + 0.05 × 180 = 38 + 9 = 47.
Calculate Shifted Green: sG = 0.433 × 180 + 0.567 × 230 = 77.94 + 130.41 = 208.35 (rounds to 208).
Calculate Shifted Blue: sB = 0.475 × 180 + 0.525 × 230 = 85.5 + 120.75 = 206.25 (rounds to 206).

The calculator reveals the shifted color with RGB (47, 208, 206), which is hex code #2FD0CE. This transformed color appears as a more muted, greenish-cyan, demonstrating how blue elements can lose their distinctiveness for those with tritanopia.

💡 When designing interfaces, especially with color-coded information, our Text Readability on Background Color Calculator can help ensure that any text remains legible against the simulated background colors.

Limitations of Tritanopia Simulation Models

While tritanopia simulation models are invaluable tools for designers, they come with inherent limitations. These models provide a generalized approximation of how colors might appear, but they cannot perfectly replicate the subjective experience of every individual with tritanopia. Color vision deficiencies exist on a spectrum, and the severity can vary significantly from person to person. Furthermore, contextual factors, such as ambient lighting, screen calibration, and the size of color swatches, can influence perception in ways that a simple algorithmic shift cannot fully capture. Therefore, simulations should be used as a guideline for identifying potential problem areas, rather than a definitive representation of every user's experience. It's always beneficial to gather feedback from diverse users where possible.

Frequently Asked Questions

What is tritanopia color blindness?

Tritanopia is a rare form of color blindness, often called blue-yellow color blindness, where individuals have difficulty distinguishing between blue and yellow hues. Blues appear greenish, and yellows may seem pinkish or grey. This condition is caused by a deficiency or absence of blue cone cells in the retina, affecting approximately 1 in 100,000 males and females equally.

How does tritanopia affect color perception?

With tritanopia, the blue end of the color spectrum is significantly impacted. Blues often look like greens, and yellows can appear as pink or light red. Green and red colors are generally perceived more normally, though their interaction with shifted blues and yellows can still alter the overall color landscape. This makes distinguishing between certain color pairs, like blue and green, particularly challenging.

Why is simulating color blindness important for designers?

Simulating color blindness is crucial for designers to create accessible and inclusive digital products, websites, and print materials. By understanding how colors appear to individuals with conditions like tritanopia, designers can choose palettes and visual cues that ensure all users can perceive and interpret information correctly, preventing frustration and exclusion for a significant portion of the population.

Are there other types of color blindness besides tritanopia?

Yes, tritanopia is one of several types of color blindness, with the most common being deuteranomaly and protanomaly (red-green color blindness). Deuteranomaly (green-weak) and protanomaly (red-weak) affect the perception of red and green hues, while protanopia (red-blind) and deuteranopia (green-blind) involve a complete absence of red or green cones. Tritanopia is the least common of these major forms.