我有一个脚本扫描文档中的所有图像类型，将它们全部转换为黑白图像，然后将黑白图像导出到新文件夹。
JPEG, TIFF, and PNG（不导出GIF文件）。
ColorSpace.GRAY或ColorSpaceEnum.GRAY属性（但确实具有JPEG文件的此属性）。
那么，有没有办法将TIFF和PNG文件转换为黑白文件 在InDesign的Extendscript中？
如果不，那么不提供的原因是什么 这些文件类型的黑白转换？
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
答案 0 :(得分：1)
那么，有没有办法将TIFF和PNG文件转换为黑白格式 InDesign的Extendscript？
不是我知道的。
如果没有，那么为这些文件类型不提供黑白转换的原因是什么？
他只有上帝才知道：D
根据您的期望，我宁愿将这些图像操作委托给Photoshop，您可以使用任何您想要的格式，任何您想要的设置。您可以使用BridgeTalk对象，也可以使用将运行Ps的hotfolder（Apple脚本）。 或者您可以使用doScript根据您的操作系统调用applescript或visualbasic，并让它们运行您可能拥有的转换工具。
祝你好运。卢瓦克
PS：也请看这个工具。也许它有一些你可以用JS调用的API http://www.rorohiko.com/wordpress/indesign-downloads/color2gray/
答案 1 :(得分：0)
所以，虽然我一直在研究使用BridgeTalk的代码版本，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由以编程方式将文件扩展名重命名为所需格式。
但是，.PDF的不能被强制转换为不同的文件格式，因为它们的格式和格式不正确。
这是我的工作代码，它与上面的代码非常相似，只有一些修改：
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，但我仍在调查此问题并在此处找到了一个很好的参考：http://www.kasyan.ho.com.ua/convert_cmyk-rgb_images_to_grayscale.html。
对于不覆盖原始图像的想法：http://forums.adobe.com/message/4292613#4292613。