Converts color temperature in Kelvin to a color in RGB color space -- and vice versa.
The conversion is designed to be fast and usable for image processing. More details on color temperature and the algorithm can be found here.
$ npm install --save color-temperture
var ct = ;//convert kelvin to RGB// eg convert typical candlelight (1850K ) to RGBvar rgb = ct;var red = rgbred;var green = rgbgreen;var blue = rgbblue;
RGB color is represented in JSON format: An RGB of [0, 128, 255] would be represented as
red : 0green : 128blue : 255
Often, the convertor is deployed as part of an image processing loop. The following example uses streams to generate a PNG similar to that at the top of this README file.
var fs = ;var png_encoder = ;var ct = ;var width = 500;var height = 100;var kelvinStart = 10;var kelvinEnd = 40000;var pixels = width * height * 3;for var w = 0; w < width; w += 1for var h = 0; h < height; h += 1var i = h*width+w*3;kelvin = kelvinEnd-kelvinStart/width* w + kelvinStart;var rgb = ct;pixelsi = rgbred;pixelsi + 1 = rgbgreen;pixelsi + 2 = rgbblue;var enc = width height;enc;enc;
There are examples in the examples directory.
NOTE The conversions use approximations and are suitable for photo-mainpulation and other non-critical uses.
Accuracy is best between 1000K and 40000K.
Convert a color temperature in Kelvin to RGB. This method uses an approximation based on a curve fit of data from a sparse RGB to Kelvin mapping.
Convert a color in RGB format to a color temperature in Kelvin.
The code is released under an MIT license.