Custom Color Screen Guide: How to Use Any Color for Testing, Lighting, and Design
A custom color screen is one of the most versatile tools in a display toolkit. Unlike fixed-color screens (white, black, red, green), a custom color screen lets you display any color you choose — specified by hex code, RGB values, or a color picker. This opens up a wide range of applications from professional monitor calibration to creative photography lighting.
Understanding Color Codes
Before diving into use cases, it helps to understand the three main ways to specify a color:
Hex code (#FF5733) is the most common format in web design. The six characters represent red, green, and blue values in hexadecimal (base 16). The first two characters are red (00-FF), the next two are green, and the last two are blue. #FF0000 is pure red, #00FF00 is pure green, #0000FF is pure blue.
RGB (255, 87, 51) specifies the same information in decimal. Each channel ranges from 0 (none) to 255 (maximum). RGB(255, 0, 0) is pure red, RGB(0, 255, 0) is pure green.
HSL (14°, 100%, 60%) describes color differently: hue (the color angle on a color wheel, 0-360°), saturation (color intensity, 0-100%), and lightness (brightness, 0-100%). HSL is often more intuitive for adjusting colors — to make a color lighter, increase the L value; to make it less saturated, decrease the S value.
Our Custom Color tool shows all three values simultaneously and lets you adjust any of them.
Monitor Testing and Calibration
The most professional use of a custom color screen is monitor testing. Different colors reveal different types of display defects:
Pure white (#FFFFFF): Reveals dead pixels (appear as dark dots), backlight bleeding (bright patches at edges), and color uniformity issues (areas that appear slightly yellow, blue, or pink).
Pure black (#000000): Reveals stuck pixels (appear as colored dots), backlight bleeding (bright patches on dark background), and OLED burn-in.
Pure red (#FF0000), green (#00FF00), blue (#0000FF): Each solid primary color reveals stuck pixels of the opposite colors and tests the monitor's color accuracy for that channel.
Medium gray (#808080): The most revealing color for uniformity testing. Subtle variations in brightness and color temperature are most visible on gray.
Chroma green (#00B140): The standard chroma key green used in video production. Use this to verify your monitor displays the correct shade for green screen work.
Photography and Video Lighting
Your screen is a light source. A custom color screen lets you use that light source at any color temperature or hue.
Warm white (~#FFF5E0): Simulates warm incandescent lighting. Use as a fill light for portraits to add warmth.
Cool white (~#E8F4FF): Simulates daylight or cool LED lighting. Use for product photography requiring neutral, accurate color rendering.
Colored fill light: Use any color as a creative fill light for portraits, product shots, or video. A blue fill light on one side and a warm fill on the other creates a dramatic split-lighting effect.
Color matching: If you're shooting in a room with a specific color cast (warm tungsten lights, cool fluorescent), match your screen color to the ambient light for consistent fill lighting.
Graphic Design and Color Reference
Designers use custom color screens to:
Check color accuracy: Display a specific brand color (Coca-Cola red: #F40009, Facebook blue: #1877F2) and compare it to printed materials or physical products.
Test color combinations: Display a background color in fullscreen and hold up physical materials, fabric samples, or printed designs to see how they look together.
Calibrate monitors: Use known reference colors to check if your monitor is displaying colors accurately. If #FF0000 looks orange or pink rather than pure red, your monitor needs calibration.
Chroma Key Reference Colors
For video production, these are the standard chroma key colors:
| Color | Hex Code | Use Case |
|---|---|---|
| Chroma Green | #00B140 | Standard green screen |
| Chroma Blue | #0047AB | Blue screen (for green subjects) |
| Ultra Key Green | #00FF00 | Software-specific green |
Display these colors in fullscreen to verify your monitor shows the correct shade, or use the screen itself as a virtual green/blue screen backdrop.
Use Our Free Custom Color Tool
Our Custom Color tool features:
- Native color picker for visual color selection
- Hex code input with real-time preview
- RGB sliders for precise channel control
- HSL values displayed automatically
- 12 presets including chroma green, warm white, and pure primaries
- One-click hex code copy
- Fullscreen mode
Related tools: Green Screen · White Screen · Pixel Test