![]() An example of a Hex color representation is #123456, 12 is Red, 34 is Green, and 56 is Blue. Hex - 6-digit, 24 bit, hexidecimal number that represents Red, Green, and Blue.The most common ways to represent color on the web are via a 6-digit HEX number, RGB, and HSL. This lets us implement most of our color(for year: Int) function.Digital color can be represented in a number of ways. This lets you overshoot the end of the hue circle and mod by 360º to get back to a reasonable color. Circles loop back on themselves, and therefore 359º is basically the same color as 1º. ![]() There’s a physical analogy here to a hue circle. I find this to be more illustrative, because this value represents some number of degrees. This color picker shows examples of these colors.Īstute readers will note that, while Apple’s own APIs take a number from 0 to 1, this fake initializer I made expects a hue from 0 to 360. (There are subtle differences between HSL, HSB, HSV, and HWB, but the hue rotation is basically the same in all of the color models, and any of them will work well with this technique.)įor example, using 0.8 for both saturation and lightness gives you nice pastels: Color(hue. The idea is this: by using a hue based color space, like HSL, you can hold two parameters constant (saturation and lightness), and modify only the hue, giving you multiple colors that live in the same “family”. There are a few blog posts out there (warning: JavaScript) that lay out an approach. RGB is focused on how color is produced, rather than how it’s perceived.įortunately, the solution to this problem is well documented. They often come out muddy and ruddy, and generating more than one color doesn’t come with any pattern or structure. Unfortunately, colors generated like this look really bad. RGB can really only satisfy the first of my criteria - it can make random colors with random numbers: Color(red. We need to implement a function like this: func color(for year: Int) -> Color I need some colors that are a) arbitrary feeling, b) nice looking, and c) determined purely by an integer for the year. How many years am I going to do this for until I find an algorithm with which to automate it? Each year needs a different color on the graph, and so every new year I go into the code, find a nice new color for the new year, and deploy the app. I have a personal app where I need to show a graph of some years. There are other representations of colors that lend themselves to being changed more easily. Then you start increasing the “green”, and you get…yellow? This is not a very intuitive color space to navigate around. If you start from black, you can increase the amount of “red” in an RGB color picker, which will make things more red. You’re currently looking at millions of tiny little 3 light arrays, and yet the effect is so totalizing that you almost never think about it.įinally, RGB is hard to manipulate. From far enough away, you can’t convince your mind that there are three lights. Red, green, and blue additive light don’t behave like much that we’re used to - you can see the individual colors up close but as you get further away, they blend together and you start to see only one color. ![]() Your RGB values are not corresponding to display voltages and they probably haven’t for a while now. We have other displays that have twice as much blue as red or green. However, in practice, we now have phones with displays that let you show more than 100% red, which is a new type of red called super red. In theory, RGB is a group of color spaces that lets you tell the display how much voltage each subpixel needs. RGB, not unlike ASCII, memory addresses, and having 86,400 seconds in day, is one of those things that makes programming a little simpler for a bit, until it doesn’t anymore.
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