Filters> Sunglasses color your world. Everything looks browner or pinker or bluer, depending on the color of the glass. Sunglasses filter (block) some colors and let other colors through.
See for yourself: Find pieces of cellophane (colored, see-through material). Place one piece at a time over a flashlight. Check out the objects in a darkened room. Double check them in a well lit room. What happens when you use two different colors of cellophane? What happens when you look through the cellophane directly? What colors do you see? What colors don’t you see?
Photographers put color filters on their cameras. The filters block out some light and let other light through. The photograph ends up with a different color than the original image. Filters can make a sunset appear redder, for example.
The colors of objects will often look very different when seen through a color filter. White colors, for instance, take on the color of the filter - the filter removes all the colors of the <#5378,14><!spectrum> except the color it lets through. But a pure red apple will look black when seen through a green or blue filter. That’s because those filters block all the red light from the apple, allowing none to get through. And when no color of light reaches your eye, you see black.
