What is the correct way to translate from RGB to a position on color wheel? As it shows same red color hue in multiple places like this example: Y = radius * math.sin(math.radians(hsl.hue)) Radius = hsl.saturation * color_circle_radius I try ignoring luminosity and plotting by treating HSL data as Polar coordinate (hue = angle, saturation = length of radius (scaled by some factor)) def polar2cartesian(hsl): How do you map 3 piece of data onto a 2d plane? 3 pieces of data still make up the color: Hue, saturation, and luminosity. However, after converting to HSL, I'm still confused. I googled and learned that HSL color more accurately maps to color wheel. As alternative, I tried histogram of individual channels, but this did not give me the insight I am interested in. The image uses a restricted palette, and I would like to see how these colors are "distributed" by plotting them along the color wheel. * * The algorithm to convert a HSV value to a RGB value is taken from Chris Hulbert's blog (splinter) * * Created 1 January 2011 * By Eduardo A.I have small set of color data that I want to investigate. * * By cycling the hue value from 0 to 360 degrees, and keeping the saturation and value at 1 * we can represent all the brightest colors of the wheel, in a nice natural sequence. * The hue is represented by the angle at which the point is, the saturation represents * the length (how close to the center the point is) and the value represent the height at * which the point is. UPDATE (): Check repository at Github /* * Color Wheel LED * * Loops a RGB LED attached to pins 9,10,11 through * all the "exterior" colors of a Color Wheel * * The RGB LED uses a 3 component (red green blue) model which adds light colors to produce * a composite color. But the RGB does not make easy to loop through a more * "natural" sequence of colors. The HSV (hue saturation value) model uses a color cylinder * in which each color is a point inside the cylinder. What you need is to convert a HSV (Hue Saturation Value) scale to RGB (Red Green Blue) scale that the LED support, and then loop through the Hue domain mantaining the Saturation and Value constants.Ĭircuit is here, look for the RGB LED exampleĬode (I’ve coded it as close as I could to the Arduino sample guidelines). But it doesn’t look very natural since you expect to loop through a color hue.
Usually you begin making a loop through the RGB scale of colors. To start I made this little example of a RGB Led.
(I’ve got a lot of motivation from these guys specially the little one with big eyes). Recently I’ve been playing with Arduino, Scratch and the 3pi robot for a personal project that I hope will be interesting enough to show soon.
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