InDesign CS5 / Script:我可以将TIFF和PNG图像转换为“黑白”吗？

Question

我有一个脚本，可以扫描文档中的所有图像类型，将它们转换为黑白，然后将黑白图像导出到一个新文件夹中。

看起来，InDesign将导出这些图像文件格式：JPEG, TIFF, and PNG(它做而不是导出GIF文件)。

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但是，InDesign似乎没有用于TIFF和PNG文件的ColorSpace.GRAY或ColorSpaceEnum.GRAY属性(但确实对文件具有此属性)。

​

​

• 那么，是否有一种方法可以将TIFF和PNG文件转换为黑白文件？
• 如果存在而不是，那么不为这些文件类型提供黑白转换的理由是什么？

​

​

下面是我的代码，到目前为止，它只导出黑白JPEG文件：

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var document = app.activeDocument;
var newFolder = createFolder(document); // if subdirectory DNE, create this folder with the function below

saveAllImages(document, newFolder); // with the function below



function createFolder(doc)
{
    try
    {
      /*
         * type-casting the filePath property (of type object) into a String type;
         * must be a String type to concatenate with the subdirectory variable (also of type String)
         */
        var docPath = String(doc.filePath);
        var subdirectory = "/BLACK AND WHITE IMAGES";
    }
    catch(e)
    {
        alert(e.message);
        exit();
    }

    var imagesFolder = docPath + subdirectory; // concatenating the two variables
    if(!Folder(imagesFolder).exists)
    {
        Folder(imagesFolder).create();
    }

    return imagesFolder; // for instantiation outside of this function

} // end of function createFolder



function saveAllImages(doc, folder)
{
    var imgs = doc.allGraphics;
    var fileName = "";
    var img = "";
    var imgType = "";

    for(var i = 0; i < imgs.length; i++)
    {
        if(imgs[i].itemLink != null)
        {
            fileName = imgs[i].itemLink.name;
            img = new File(folder + "/" + fileName); // each image instantiated here
            imgType = imgs[i].imageTypeName; // image type is determined here (.tif, .jpg, .png, etc..)

            alert("This is a " + imgType + " file.");

            /*
                * array for image options, instantiated from the function below;
                * options[0] is the "MAXIMUM" image quality property, &
                * options[1] is the "GRAY" image conversion property;
                */
            var options = convertToBlackAndWhite(imgType);

            // each image exported to the new folder here, by file type
            switch(imgType)
            {
                case "GIF":
                    alert("This script cannot convert and export the GIF file:\n\t" + fileName + " !");
                    break;

                case "TIFF":

            case "EPS":

                case "JPG":
                    options[0]; // maximum image quality
                    options[1]; // black & white conversion

                    imgs[i].exportFile(ExportFormat.JPG, img, false);
                    break;

                case "PNG":
                    options[0]; // maximum image quality
                    options[1]; // black & white conversion

                    imgs[i].exportFile(ExportFormat.PNG_TYPE, img, false);
                    break;

                default:
                    alert("\tUnlisted image type: " + imgType + "!\nAdd this type to the switch statement.");
                    break;
            } // end of switch statement

        } // end of if statement
    } // end of for loop

} // end of function saveAllImages



        function convertToBlackAndWhite(fileType)
        {
            // array for image-quality and color-conversion values
            var settings = [];

            // each image exported to the new folder here, by file type
            switch(fileType)
            {
                case "TIFF":

                case "PNG":

            case "EPS":

                case "JPG":
                    settings[0] = "app.jpegExportPreferences.jpegQuality = JPEGOptionsQuality.MAXIMUM"; // maximum image quality
                    settings[1] = "app.jpegExportPreferences.jpegColorSpace = JpegColorSpaceEnum.GRAY"; // black & white conversion
                    break;

                default:
                    break;

            } // end of switch statement

            return settings; // for instantiation outside of this function

        } // end of function convertToBlackAndWhite

Answer 1

那么，是否有一种方法可以将TIFF和PNG文件转换为黑白文件？

据我所知没有。

如果没有，那么不为这些文件类型提供黑白转换的理由是什么？

他只有上帝知道

鉴于您的期望，我宁愿将这些图像操作委托给Photoshop，在那里您可以使用您想要的任何格式，任何您想要的设置。您可以使用BridgeTalk对象，也可以有一个将运行Ps的热文件夹( applescript )。或者，您可以使用doScript调用applescript或visualbasic，这取决于您的操作系统，并让它们运行您可能拥有的一些转换工具。

祝好运。

洛奇

PS:也见此工具。也许它有一些你可以用JS http://www.rorohiko.com/wordpress/indesign-downloads/color2gray/调用的API。

Answer 2

因此，虽然我一直在开发使用BridgeTalk的此代码版本，但最近我发现，应用于JPEG的任何格式都可以应用于..BMP、.TIF、..EPS和..PNG，方法是随后通过编程方式将文件扩展名重命名为所需的格式。

但是，..PDF的不能强制转换成不同的文件格式，因为它们随后被错误地格式化和损坏。

下面是我的工作代码，它非常类似于上面的代码，但有一些修改：

var document = app.activeDocument;
var newFolder = createFolder(document); // if subdirectory images DNE, create this folder with the function below

saveAllImages(document, newFolder); // with the function below

//---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

function createFolder(doc)
{
    try
    {
      /*
         * type-casting the filePath property (of type object) into a String type;
         * must be a String type to concatenate with the subdirectory variable (also of type String)
         */
        var docPath = String(doc.filePath);
        var subdirectory = "/BLACK AND WHITE IMAGES";
    }
    catch(e)
    {
        alert(e.message);
        exit();
    }

    var imagesFolder = docPath + subdirectory; // concatenating the two variables
    if(!Folder(imagesFolder).exists)
    {
        Folder(imagesFolder).create();
    }

    return imagesFolder; // for instantiation outside of this function

} // end of function createFolder

//---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

function saveAllImages(doc, folder)
{
    var imgs = doc.allGraphics;
    var fileName = "";
    var img = "";
    var imgType = "";

    for(var i = 0; i < imgs.length; i++)
    {
        if(imgs[i].itemLink != null)
        {
            fileName = imgs[i].itemLink.name;
            var str = fileName.substr(0, fileName.length - 4) + ".tif"; // converting all file types to .TIF
            img = new File(folder + "/" + str); // each image instantiated here
            imgType = imgs[i].imageTypeName; // image type is determined here (.tif, .jpg, .png, etc..)

            //alert("The file \"" + fileName + "\"\n\tis a " + imgType + " file.");

            /*
                * array for image options, instantiated from the function below;
                * options[0] is the "MAXIMUM" image quality property, &
                * options[1] is the "GRAY" image conversion property;
                */
            var options = convertToBlackAndWhite(imgType);

            // each image exported to the new folder here, by file type
            switch(imgType)
            {
                case "GIF":
                    alert("This script cannot convert and export the GIF file:\n\t" + fileName + " !");
                    break;

                case "Adobe PDF":
                    // PDF file type does not have the maximum image quality property
                    options[1]; // black & white conversion

                    imgs[i].exportFile(ExportFormat.PDF_TYPE, img, false);
                    break;

                case "EPS":
                    // PDF file type does not have the maximum image quality property
                    options[1]; // black & white conversion

                    imgs[i].exportFile(ExportFormat.EPS_TYPE, img, false);
                    break;

                case "Windows Bitmap":
                case "PNG":
                case "TIFF":
                case "JPEG":
                    options[0]; // maximum image quality
                    options[1]; // black & white conversion

                    imgs[i].exportFile(ExportFormat.JPG, img, false);
                    break;

                default:
                    alert("\tUnlisted image type: " + imgType + "!\nAdd this type to the switch statement.");
                    break;
            } // end of switch statement

            replaceWithNewImage(doc, fileName, img); // with the function below

        } // end of if statement
    } // end of for loop

} // end of function saveAllImages

//---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

        function convertToBlackAndWhite(fileType)
        {
            // array for image-quality and color-conversion values
            var settings = [];

            // each image exported to the new folder here, by file type
            switch(fileType)
            {
                case "Adobe PDF":
                    settings[0] = ""; // PDF file type does not have the maximum image quality property
                    settings[1] = "app.pdfExportPreferences.pdfColorSpace = PDFColorSpace.GRAY"; // black & white conversion
                    break;

                case "EPS":
                    settings[0] = ""; // EPS file type does not have the maximum image quality property
                    settings[1] = "app.epsExportPreferences.epsColorSpace = EPSColorSpace.GRAY"; // black & white conversion
                    break;

                case "Windows Bitmap":
                case "PNG":
                case "TIFF":
                case "JPEG":
                    settings[0] = "app.jpegExportPreferences.jpegQuality = JPEGOptionsQuality.MAXIMUM"; // maximum image quality
                    settings[1] = "app.jpegExportPreferences.jpegColorSpace = JpegColorSpaceEnum.GRAY"; // black & white conversion
                    break;

                default:
                    break;
            } // end of switch statement

            return settings; // for instantiation outside of this function

        } // end of function convertToBlackAndWhite

虽然我没有使用BridgeTalk，但我仍然在研究这个问题，并在这里找到了一个很好的参考：grayscale.html。

关于不覆盖原始图像的想法：http://forums.adobe.com/message/4292613#4292613。