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Four primary colors
I've already posted about my origami decoration. My choice of colors is not random. Of course I could make it more colorful, but evey paint costs some money, so I decided to buy just four: red, green, yellow and blue. Why?
That's because I still keep in my mind the great article Color Wheels are wrong? How color vision actually works. It tells that although our eyes can see three colors: red, green and blue (RGB), our perception is not that simple and direct. Our vision first does the difference between R and G, so each color is even more red or more green. Next and more importantly, it does the difference between RG and B, so each color is either more yellow (or red, or green) also known as warm colors, or more blue, aka cool colors.
That's also how photo manipulation software works (e.g. Adobe Lightroom). Instead of scrollbars for RGB, you can find there two scrollbars: to choose between more red and more green (called tint) and between more yellow and more blue (called temperature).
That's why it could be said that for our vision, there are four primary colors: red, green, yellow and blue.
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