people of the internet! I'm making a program that needs to try and find the closest RGB match of lots of pixels, using Jimp.
Say if you had a color that was slightly purple, I would want to change it to the purple that I have in my table, here:
var colors = [
[0,0,255,0],
[1,255,165,0],
[2,0,0,255],
[3,255,192,203],
[4,165,42,42],
[5,255,255,255],
[6,0,0,0],
[7,230,230,350],
[8,255,255,0],
[9,0,0,0],
]
(the first number in one of these arrays can be ignored, the rest are just R, G, and B)
So if I had a red like (255,7,1) I would like to match that to the red in my table, being (255,0,0)
I have tried something, but rather it was very dumb and didn't work, so I will spare you the details.
Can anybody help me? Thanks!
RGB is a 3-dimensional space. Consider a color as a point in 3d space, you should find most closest distance between two points by using 3d pythagoras.
const colors = [
[0,0,255,0],
[1,255,165,0],
[2,0,0,255],
[3,255,192,203],
[4,165,42,42],
[5,255,255,255],
[6,0,0,0],
[7,230,230,350],
[8,255,255,0],
[9,0,0,0],
]
function get_closest_color(colors, [r2, g2, b2]) {
const [[closest_color_id]] = (
colors
.map(([id, r1,g1,b1]) => (
[id, Math.sqrt((r2-r1)**2 + (g2-g1)**2 + (b2-b1)**2)]
))
.sort(([, d1], [, d2]) => d1 - d2)
);
return colors.find(([id]) => id == closest_color_id);
}
const closest_color = get_closest_color(colors, [230, 200,0]);
console.log(closest_color);If I undestand your question correctly you can do something like this
const colors = [
[0,0,255,0],
[1,255,165,0],
[2,0,0,255],
[3,255,192,203],
[4,165,42,42],
[5,255,255,255],
[6,0,0,0],
[7,230,230,350],
[8,255,255,0],
[9,0,0,0],
]
const findClosestColor = (color, colors) =>
colors.reduce((res, c) => {
const distance = [1,2,3].reduce((sum, i) => sum + Math.abs(c[i] - color[i]), 0)
if(distance > res.distance){
return res;
}
return {
closest: c,
distance
}
}, {closest: null, distance: 9999} ).closest
console.log(findClosestColor([0, 255,7,1], [[1,0,0,200], [2,255,0,0], [3, 128,128,128]]))Use the function(s) from here to find the color with the smallest E distance