【AE脚本示例】颜色转换函数 AE颜色 RGB HSL HEX

//SOURCE:https://github.com/VinhSonNguyen/AfterEffects-ExtendScript-Extensions/blob/master/colorConversion.jsx

//将十六进制字符串转换为 AE的 0-1 十进制格式
function hexToAEColor(hexString){
    var bigInt = parseInt(hexString.replace("#",""), 16);
    var r = (bigInt >> 16) & 255;
    var g = (bigInt >> 8) & 255;
    var b = bigInt & 255;
    return [r/255,g/255,b/255];
} 

//把AE颜色转为hex字符串
function aeColorToHex(aeColor){
    var r = aeColor[0] * 255; var g = aeColor[1] * 255; var b = aeColor[2] * 255;
    function componentToHex(c) {
        var hex = c.toString(16);
        return hex.length == 1 ? "0" + hex : hex;
    }
    return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}

//将AE颜色数组转换为普通的RGB数组
function aeColorToRGB(aeColorArray){
    var r = aeColorArray[0]; var g = aeColorArray[1]; var b = aeColorArray[2];
    return [r*255,g*255,b*255];
}

//将AE颜色数组转换为普通的RGB数组`
// Converts RGB array to AE color format. Returns array in AE color format
function rgbToAEColor(rgbArray){
    var r = rgbArray[0]; var g = rgbArray[1]; var b = rgbArray[2];
    return [r/255,g/255,b/255];
} // End rgbToAEColor() function

// RGB转HSL
function rgbToHSL(rgbArray){
    var r = rgbArray[0] / 255; var g = rgbArray[1] / 255; var b = rgbArray[2] / 255;
    var max = Math.max(r, g, b), min = Math.min(r, g, b);
    var h, s, l = (max + min) / 2;

    if(max == min){
        h = s = 0; // achromatic
    } else {
        var d = max - min;
        s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
        switch(max){
            case r: h = (g - b) / d + (g < b ? 6 : 0); break;
            case g: h = (b - r) / d + 2; break;
            case b: h = (r - g) / d + 4; break;
        }
        h /= 6;
    }
    return [h, s, l];
} // End of rgbToHSL() function

// HSL转RGB
function hslToRGB(hslArray){
    var r,g,b,h,s,l;
    h = hslArray[0];
    s = hslArray[1];
    l = hslArray[2];

    if(s == 0){
        r = g = b = l; // achromatic
    }else{
        var hue2rgb = function hue2rgb(p, q, t){
            if(t < 0) t += 1;
            if(t > 1) t -= 1;
            if(t < 1/6) return p + (q - p) * 6 * t;
            if(t < 1/2) return q;
            if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
            return p;
        }

        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
        var p = 2 * l - q;
        r = hue2rgb(p, q, h + 1/3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1/3);
    }

    return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255)];
}