src/rgbquant.js
function distEuclidean(rgb0, rgb1) {
		var rd = rgb1[0]-rgb0[0],
			gd = rgb1[1]-rgb0[1],
			bd = rgb1[2]-rgb0[2];

		return Math.sqrt(Pr*rd*rd + Pg*gd*gd + Pb*bd*bd) / euclMax;
	}
function distEuclidean(rgb0, rgb1) {
		var rd = rgb1[0]-rgb0[0],
			gd = rgb1[1]-rgb0[1],
			bd = rgb1[2]-rgb0[2];

		return Math.sqrt(Pr*rd*rd + Pg*gd*gd + Pb*bd*bd) / euclMax;
	}
function distEuclidean ( rgb0 , rgb1 ) { var rd = rgb1 [ 0 ] - rgb0 [ 0 ] , gd = rgb1 [ 1 ] - rgb0 [ 1 ] , bd = rgb1 [ 2 ] - rgb0 [ 2 ] ; return Math . sqrt ( Pr * rd * rd + Pg * gd * gd + Pb * bd * bd ) / euclMax ; }
perceptual Euclidean color distance
perceptual Euclidean color distance