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Color Chart — HTML Color Codes
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Our instinct might be to say "stroke 0 " for no outline, however, it is important to remember that 0 is not "nothing", but rather denotes the color black. Also, remember not to eliminate both—with noStroke and noFill , nothing will appear! In addition, if we draw two shapes, Processing will always use the most recently specified stroke and fill, reading the code from top to bottom. Remember finger painting? By mixing three "primary" colors, any color could be generated.
Swirling all colors together resulted in a muddy brown. The more paint you added, the darker it got. Digital colors are also constructed by mixing three primary colors, but it works differently from paint. First, the primaries are diff erent: red, green, and blue i. And with color on the screen, you are mixing light, not paint, so the mixing rules are different as well. This assumes that the colors are all as bright as possible, but of course, you have a range of color available, so some red plus some green plus some blue equals gray, and a bit of red plus a bit of blue equals dark purple.
HTML Color Codes
While this may take some getting used to, the more you program and experiment with RGB color, the more it will become instinctive, much like swirling colors with your fi ngers. And of course you can't say "Mix some red with a bit of blue," you have to provide an exact amount. As with grayscale, the individual color elements are expressed as ranges from 0 none of that color to as much as possible , and they are listed in the order R, G, and B.
You will get the hang of RGB color mixing through experimentation, but next we will cover some code using some common colors.
Processing also has a color selector to aid in choosing colors. In addition to the red, green, and blue components of each color, there is an additional optional fourth component, referred to as the color's "alpha. The alpha values for an image are sometimes referred to collectively as the "alpha channel" of an image.
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It is important to realize that pixels are not literally transparent, this is simply a convenient illusion that is accomplished by blending colors. Behind the scenes, Processing takes the color numbers and adds a percentage of one to a percentage of another, creating the optical perception of blending.
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