The Science Behind Colour Afterimages
Cone Cell Adaptation: Your eyes contain three types of cone cells that detect red, green, and blue light. When you stare at a coloured stimulus for an extended period, these cells become fatigued and less responsive.
Opponent Process Theory: Your visual system processes colours in opposing pairs: red-green, blue-yellow, and black-white. When one colour in a pair is overstimulated, you temporarily see its opposite.
Interactive Colour Wheel: Click on any wedge to see its complementary colour
What You're Experiencing:
- Laser Area Afterimage: After staring at the red laser, the red-sensitive cones become fatigued. When you look at the white screen, those areas appear cyan (red's true complement).
- Filter Afterimage: The coloured filter fatigues different cone cells across your entire visual field, creating a complementary colour afterimage in the background.
Real-World Applications: This effect explains why you might see coloured spots after looking at bright lights, or why photographers use grey cards to reset their colour perception.