Light is one heavy subject.
You're told that the primary colors in painting are red, yellow, and blue, but then you learn that the cones in our eyes only sense red, green, and blue. All light together makes white light, but all color paint together make brown and black. What gives?
The science of colored light is incredible, and there's so much to learn. I was fascinated by a particular project called "Three Little Pigments" at the Exploratorium, where you can explore pigments and light color with printing on transparencies. They have a great explanation of the science in this project. In it, you have four separate transparent sheets, and when you combine them and hold them up to a light, it becomes a recognizable image. Watching the colors combine is absolutely magical. And optically scientific.
In the project, you can only use their pre-made landscape, but I wanted to show how you can turn any image in to this project to make a wonderful investigation have a locally meaningful picture behind it. And now, here's how!
- What: Making Color Mash-Ups
- Time: ~30 minutes to make
- Cost: ~$2, depending on print size
- Concepts: light, color, perception, pigments, wavelength
- Transparencies (laser or ink depending on your printer)
- Color Printer
- Photoshop or GMP (free version)
Let us alight!