There are a gazillion color picker sites out there that allow you to manipulate the amounts of RGB (Red, Green and Blue) light to find the color you want.
You can even play with color in Word. Just make a text box and fill it with a custom color. Be sure to print the pages to see how much difference there is between the color of light on your computer screen and the color of the inks from the printer.
The evolution of color picking systems means that there are all kinds of ways to pick the color you want and get the RGB/ hex, HSL/ HSV or CMY/CMYk codes. New apps are showing up all the time. Just do a Google image search to see a slew of pickers!
RGB + CMY
Picking a color is one thing, knowing how to shift that color is another. Understanding that the two systems work in opposite ways is a useful bit of information. I recently found a fun color mixer site right here in my front yard.
The Oregon Museum of Science and Industry has two interactive pages for playing with color in both RGB and CMY.
The first screen allows you to play with color mixing in light by sliding the percentage of Red, Green and Blue – the resulting color shows up in center of the overlapping colors and on the light meter.
To switch to the CMY system you just click on the paint brush at the bottom of the screen. The sliders on the paint tubes adjust the amount of Cyan, Magenta and Yellow to make the color in the center and at the end of the paint brush.
Hint: In the RGB system the third primary adds light. In the paint system, the third primary subtracts light.
I’ve been working on ways to show how the additive and subtractive systems are interconnected so I opened another browser to be able to line up both mixers next to each other. I mixed an Olive by “squeezing” the paint tubes and then tried to match it in light. Here’s the result.
Its hard to visually isolate the colors so I would love to see the addition of hex codes for each side. Since that’s not available, I compared the two colors in Photoshop. The RGB for the light meter color was 94, 82, 0. The right side’s paintbrush was loaded with 123, 99, 0. In hex they were #5e5200 on the left and #7b6300 on the right. Pretty close!
The Exploratorium in San Francisco has lots of crazy fun ways to play with color on the computer – but as far as I can tell they don’t have a game similar to the OMSI color mixers.
As I start to teach the two systems side-by-side, I would love to know of other sites that have interactive color mixing for both the additive and subtractive systems. An extra bonus would include partitive mixing, maybe with spinning disks on the end of a drill!