How to Implement Colorblind Modes in Video Games

Implementing colorblind modes is a vital step in modern accessible game development, ensuring that the roughly 8% of men and 0.5% of women with color vision deficiency (CVD) can fully experience a game. This article outlines the practical steps developers take to design for colorblindness, including utilizing redundant visual cues, applying post-processing screen filters, offering customizable user interface (UI) palettes, and testing games using simulated vision tools.

Understand the Types of Color Blindness

To design an effective colorblind mode, developers must first understand the three primary types of color vision deficiencies they need to accommodate:

• Protanopia: Red-weakness/insensitivity, making reds look duller and harder to distinguish from greens.
• Deuteranopia: Green-weakness/insensitivity, which is the most common form and makes greens indistinguishable from reds.
• Tritanopia: Blue-weakness/insensitivity, a rarer form that makes it difficult to distinguish between blue and yellow, or green and violet.

By targeting these three specific categories, developers can create tailored accessibility profiles within their games’ settings.

Implement Redundant Design (Don’t Rely Only on Color)

The most effective way to implement colorblind accessibility is to design the game so that color is never the sole source of information. This concept is known as redundant design.

If a game uses red to indicate enemies and green to indicate allies, developers should also use distinct shapes, icons, or text. For example, in a first-person shooter, enemies might have a triangle icon above their heads, while allies have a circle. In puzzle games, matching mechanics should rely on both color and unique symbols or patterns on the game pieces.

Offer Dedicated UI Preset Profiles

Many developers include specific toggle options in the accessibility menu for Protanopia, Deuteranopia, and Tritanopia. When activated, these presets alter the colors of critical UI elements, HUDs, map icons, and reticles to combinations that are easily distinguishable for players with that specific type of color blindness.

Modern games often avoid applying a blanket filter to the entire game world, as this can distort the art style. Instead, developers selectively target the user interface, player names, and objective markers, which are the most critical elements for gameplay.

Allow Full Palette Customization

The gold standard of colorblind accessibility is allowing players to fully customize individual color channels. Instead of relying on presets, games like Overwatch and Battlefield allow players to choose the exact color of their crosshairs, enemy outlines, ally indicators, and squad markers from a wide color wheel. This level of customization accommodates players with varying degrees of severity in their color blindness, as well as those with general low vision.

Use Post-Processing Screen Filters

For smaller development teams or retrofitting older games, post-processing shaders are a common solution. Developers can apply a full-screen color-shifting filter that remaps problematic color spectrums into visible ones. While this can sometimes make the game look unnatural to players with standard vision, it is a highly efficient way to make a game playable without redesigning individual assets or UI elements.

Test with Simulation Tools and Playtesters

Developers integrate colorblind simulators directly into their development pipelines. Game engines like Unity and Unreal Engine offer built-in viewport views that simulate different types of CVD in real-time. Additionally, developers use software plugins and image editors to verify that level designs, maps, and menus remain readable. Ultimately, the most reliable testing method is hiring colorblind QA testers to play the game and provide direct feedback on the readability of the visual design.