Primary & Secondary Colors
Custom Color
Color Test Tool
Test RGB color accuracy and display calibration with primary colors, secondary colors, and custom color picker. Perfect for checking color reproduction on monitors, TVs, and mobile devices.
How to Use
- 1.Select a color from the palette or use the custom color picker
- 2.Click the display or press 'F' to enter fullscreen mode
- 3.Check if colors appear accurate and uniform across the entire screen
- 4.Test each primary color (Red, Green, Blue) to verify subpixel functionality
- 5.Press 'Escape' or click to exit fullscreen when finished
Understanding RGB Colors
Red (#FF0000)
Tests red subpixels. Should appear as pure red with no orange or pink tint.
Green (#00FF00)
Tests green subpixels. Should be bright green, not yellow or blue-green.
Blue (#0000FF)
Tests blue subpixels. Should be pure blue, not purple or cyan.
Frequently Asked Questions
What should I look for during color testing?
Check for color uniformity (no patches or gradients), accurate hue (no color shifts), and proper brightness. Colors should match across your entire screen.
Why do colors look different on different screens?
Each display has different color gamut, calibration, and panel technology. OLED displays show more vibrant colors than LCD, while IPS panels have better color accuracy than TN panels.
How do I calibrate my monitor colors?
Use this tool to identify color issues, then adjust your monitor's color settings or use professional calibration tools like a colorimeter for accurate results.
Is this tool free?
Yes! Completely free, no download, no signup required. Works on all devices including phones, tablets, and desktop monitors.
What's the difference between primary and secondary colors?
Primary colors (Red, Green, Blue) are single subpixels. Secondary colors (Cyan, Magenta, Yellow) are combinations of two primaries. All three primaries create White.