Adobe Illustrator JS脚本：如何识别全局CMYK印刷色？

编写了一段Adobe Illustrator JSX脚本，旨在遍历当前文档色板中的所有色样，识别出CMYK印刷色并进行处理，但在识别全局色时遇到困难：大部分色样为全局色，使用swatch.color.typename、swatch.color.space、swatch.color.colorType和swatch.color.colorModel属性时，全局印刷色的颜色模式返回undefined，typename返回"SPOT COLOR"，无法正确识别。

原脚本内容 #

// Get the swatches
var swatches = app.activeDocument.swatches;

/*** DO NOT USE
var ColorModel = {CMYK: "CMYK", RGB: "RGB", LAB: "LAB", GRAY: "GRAY", SPOT: "SPOT", CMYK_PROCESS: "CMYK_PROCESS"};
***/

// Set the progress bar
var progressWindow = new Window("palette", "Script Progress", [150, 150, 600, 200]);
progressWindow.bar = progressWindow.add("progressbar", [20, 35, 420, 60], 0, swatches.length);
progressWindow.show();

// Function to round colors
function roundColorValues(color) {
    var col = color;
    col.cyan = Math.round(col.cyan);
    col.magenta = Math.round(col.magenta);
    col.yellow = Math.round(col.yellow);
    col.black = Math.round(col.black);
}

// Function to set colors
function setColorValues(color) {
    var col = color;

    if (col.cyan <= 3) {
        col.cyan = 0;
    }
    else if (col.magenta <= 3) {
        col.magenta = 0;
    }
    else if (col.yellow <= 3) {
        col.yellow = 0;
    }
    else if (col.black <= 3) {
        col.black = 0;
    }
}

// Loop through the swatches
for (i = 0; i < swatches.length; i++) {
    // Update the progress bar
    progressWindow.bar.value = i + 1;
    progressWindow.update();

    // Get the swatch
    var swatch = swatches[i];
    var colorModel = swatch.color.colorModel;

    // Check if swatch is CMYK
    if (colorModel == ColorModel.CMYK) {
        alert("CMYK Color Found");
        roundColorValues(swatch.color);
        setColorValues(swatch.color);
    }
}

// Close the progress bar
progressWindow.close();

// Show the alert
alert("Complete!");

问题原因与解决方案 #

Illustrator中全局印刷色（Process Global Color）的结构特殊：它的swatch.color是SpotColor类型，但内部通过processColor属性存储实际的CMYK颜色信息。直接访问swatch.color.colorModel会返回undefined，因为SpotColor本身没有这个属性，需要访问其内部的processColor对象。

同时原脚本的setColorValues函数使用else if会导致仅第一个符合条件的通道被置0，需改为独立的if判断，确保所有符合条件的通道都能被处理。

修改后的脚本 #

// Get the swatches
var swatches = app.activeDocument.swatches;

// Set the progress bar
var progressWindow = new Window("palette", "Script Progress", [150, 150, 600, 200]);
progressWindow.bar = progressWindow.add("progressbar", [20, 35, 420, 60], 0, swatches.length);
progressWindow.show();

// Function to round CMYK color values
function roundColorValues(color) {
    color.cyan = Math.round(color.cyan);
    color.magenta = Math.round(color.magenta);
    color.yellow = Math.round(color.yellow);
    color.black = Math.round(color.black);
}

// Function to set low color values to 0
function setColorValues(color) {
    if (color.cyan <= 3) color.cyan = 0;
    if (color.magenta <= 3) color.magenta = 0;
    if (color.yellow <= 3) color.yellow = 0;
    if (color.black <= 3) color.black = 0;
}

// Loop through all swatches
for (var i = 0; i < swatches.length; i++) {
    // Update progress bar
    progressWindow.bar.value = i + 1;
    progressWindow.update();

    var swatch = swatches[i];
    var targetColor = null;

    // Check for standard CMYK swatches
    if (swatch.color.colorModel === ColorModel.CMYK) {
        targetColor = swatch.color;
    }
    // Check for global CMYK process swatches (SpotColor with Process type)
    else if (swatch.color.typename === "SpotColor" && swatch.color.colorType === ColorType.PROCESS) {
        if (swatch.color.processColor.colorModel === ColorModel.CMYK) {
            targetColor = swatch.color.processColor;
        }
    }

    // Process the color if it's a CMYK type
    if (targetColor) {
        roundColorValues(targetColor);
        setColorValues(targetColor);
    }
}

// Clean up and notify
progressWindow.close();
alert("Complete!");

关键修改点 #

• 新增全局印刷色的判断逻辑：通过swatch.color.typename === "SpotColor"和swatch.color.colorType === ColorType.PROCESS识别全局色，再检查processColor.colorModel是否为CMYK。
• 修改setColorValues函数的条件判断为独立if，确保所有低数值通道都能被置0。
• 使用Illustrator内置的ColorModel和ColorType枚举，无需自定义。

内容的提问来源于stack exchange，提问作者ClintonPM