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//rgba(grey,grey,grey,1)

function rgb2Grey(r,g,b)

{

var grey=Math.round((r*299 + g*587 + b*114 + 500) / 1000)

return grey

}

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//rbg

function isSimilarColorRBG(r1, g1, b1, r2, g2, b2, offset)

{

if (Math.sqrt((r1 - r2) * (r1 - r2) + (g1 - g2) * (g1 - g2) + (b1 - b2) * (b1 - b2)) < offset)

{

return true;

}

else

{

return false;

}

}

//hex

function isSimilarColorHEX(sHexColorA, sHexColorB, nOffset)

{

this.offsetNum = Math.abs(nOffset);

this.offsetNum > 255 ? this.offsetNum = this.offsetNum - 256 : "";

var arrNumA = [parseInt(sHexColorA.substring(0, 2), 16),

parseInt(sHexColorA.substring(2, 4), 16),

parseInt(sHexColorA.substring(4, 6), 16)

];

var arrNumB = [parseInt(sHexColorB.substring(0, 2), 16),

parseInt(sHexColorB.substring(2, 4), 16),

parseInt(sHexColorB.substring(4, 6), 16)

];

for (var i = 0; i < arrNumA.length; i++)

{

if (Math.abs(arrNumA[i] - arrNumB[i]) > this.offsetNum)

{

return false;//不相似

};

}

return true;//相似

}

RGB轉HEX

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//rgbToHex("rbg(r,g,b)")

function rgb2Hex(rgb)

{

var color = rgb.toString().match(/\d+/g);

var hex = "#";

for (var i = 0; i < 3; i++)

{

hex += ("0" + Number(color[i]).toString(16)).slice(-2);

}

return hex;

}