我正在使用Ghost4j将多页PDF转换为多页TIFF图像。我还没有找到这样做的例子。
使用下面的代码我可以将多页PDF转换成图像但是如何从中创建单个多页TIFF图像？
PDFDocument lDocument = new PDFDocument();
lDocument.load(filePath);
// create renderer
SimpleRenderer lRenderer = new SimpleRenderer();
// set resolution (in DPI)
lRenderer.setResolution(300);
// render as images
List<Image> lImages = lRenderer.render(lDocument);
Iterator<Image> lImageIterator = lImages.iterator();
//how to convert the images to a single TIFF image?
答案 0 :(得分：0)
虽然这不是你正在做的事情，但我做了类似的事情。我将一个目录中的多个图像合并到一个带有单独页面的tiff文件中。看看这段代码，看看你是否能找到你需要的东西。此外，您需要外部罐子/库才能使用它们，只需谷歌即可下载。我希望这会对你有所帮助。
public class CombineImages {
private static String directory = null;
private static String combinedImageLocation = null;
private static DateFormat dateFormat = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
private static int folderCount = 0;
private static int totalFolderCount = 0;
public static void main(String[] args) throws IOException {
Scanner scanner = new Scanner(System.in);
System.out.println("Please enter the directory path that contains the images: ");
directory = scanner.nextLine(); //initialize directory
System.out.println("Please enter a location for the new combined images to be placed: ");
combinedImageLocation = scanner.nextLine(); //initialize directory
if(!(combinedImageLocation.charAt((combinedImageLocation.length() - 1)) == '\\'))
{
combinedImageLocation += "\\";
}
if(!(directory.charAt((directory.length() - 1)) == '\\'))
{
directory += "\\";
}
scanner.close();
//directory = "C:\\Users\\sorensenb\\Desktop\\CombinePhotos\\";
//combinedImageLocation = "C:\\Users\\sorensenb\\Desktop\\NewImages\\";
File filesDirectory;
filesDirectory = new File(directory);
File[] files; //holds files in given directory
if(filesDirectory.exists())
{
files = filesDirectory.listFiles();
totalFolderCount = files.length;
folderCount = 0;
if(files != null && (files.length > 0))
{
System.out.println("Start Combining Files...");
System.out.println("Start Time: " + dateFormat.format(new Date()));
combineImages(files);
System.out.println("Finished Combining Files.");
System.out.println("Finish Time: " + dateFormat.format(new Date()));
}
}
else
{
System.out.println("Directory does not exist!");
System.exit(1);
}
}
public static void combineImages(File[] files)
{
int fileCounter = 1;
ArrayList<String> allFiles = new ArrayList<String>();
String folderBase = "";
String parentFolder = "";
String currentFileName = "";
String previousFileName = "";
File previousFile = null;
int counter = 0;
for(File file:files)
{
if(file.isDirectory())
{
folderCount++;
System.out.println("Folder " + folderCount + " out of " + totalFolderCount + " folders.");
combineImages(file.listFiles());
}
else
{
try {
folderBase = file.getParentFile().getCanonicalPath();
parentFolder = file.getParentFile().getName();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(counter == 0)
{
allFiles.add(file.getName().substring(0, file.getName().indexOf('.')));
}
else
{
currentFileName = file.getName();
previousFileName = previousFile.getName();
currentFileName = currentFileName.substring(0, currentFileName.indexOf('.'));
previousFileName = previousFileName.substring(0, previousFileName.indexOf('.'));
if(!currentFileName.equalsIgnoreCase(previousFileName))
{
allFiles.add(currentFileName);
}
}
}
previousFile = file;
counter++;
}
System.out.println("Total Files to be Combined: " + allFiles.size());
for(String currentFile:allFiles)
{
System.out.println("File " + fileCounter + " out of " + allFiles.size() + " CurrentFile: " + currentFile);
try {
createNewImage(currentFile, files, folderBase, parentFolder);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
fileCounter++;
}
}
***public static void createNewImage(String currentFile, File[] files, String folderBase, String parentFolder) throws IOException
{
//BufferedImage image;
int totalHeight = 0;
int maxWidth = 0;
int currentHeight = 0;
ArrayList<String> allFiles = new ArrayList<String>();
for(File file:files)
{
if((file.getName().substring(0, file.getName().indexOf('.'))).equalsIgnoreCase(currentFile))
{
allFiles.add(file.getName());
}
}
allFiles = sortFiles(allFiles);
BufferedImage image[] = new BufferedImage[allFiles.size()];
SeekableStream ss = null;
PlanarImage op = null;
for (int i = 0; i < allFiles.size(); i++) {
ss = new FileSeekableStream(folderBase + "\\" + allFiles.get(i));
ImageDecoder decoder = ImageCodec.createImageDecoder("tiff", ss, null);
op = new NullOpImage(decoder.decodeAsRenderedImage(0),
null, null, OpImage.OP_IO_BOUND);
image[i] = op.getAsBufferedImage();
}
op.dispose();
ss.close();
/*BufferedImage convertImage;
for(int i = 0; i < image.length; i++)
{
convertImage = new BufferedImage(image[i].getWidth(),image[i].getHeight(), BufferedImage.TYPE_BYTE_GRAY);
Graphics g = convertImage.getGraphics();
g.drawImage(convertImage, 0, 0, null);
g.dispose();
image[i] = convertImage;
}*/
File folderExists = new File(combinedImageLocation);
if(!folderExists.exists())
{
folderExists.mkdirs();
}
TIFFEncodeParam params = new TIFFEncodeParam();
params.setCompression(TIFFEncodeParam.COMPRESSION_GROUP3_1D);
int changeName = 1;
String tempCurrentFile = currentFile;
while((new File(combinedImageLocation + tempCurrentFile + "Combined.tif").exists()))
{
tempCurrentFile = currentFile;
tempCurrentFile += ("(" + changeName + ")");
changeName++;
}
currentFile = tempCurrentFile;
OutputStream out = new FileOutputStream(combinedImageLocation + currentFile + "Combined" + ".tif");
ImageEncoder encoder = ImageCodec.createImageEncoder("tiff", out, params);
Vector vector = new Vector();
for (int i = 1; i < allFiles.size(); i++) {
vector.add(image[i]);
}
params.setExtraImages(vector.iterator());
encoder.encode(image[0]);
for(int i = 0; i < image.length; i++)
{
image[i].flush();
}
out.close();
System.gc();
/*for(String file:allFiles)
{
image = ImageIO.read(new File(folderBase, file));
int w = image.getWidth();
int h = image.getHeight();
totalHeight += h;
if(w > maxWidth)
{
maxWidth = w;
}
image.flush();
}
BufferedImage combined = new BufferedImage((maxWidth), (totalHeight), BufferedImage.TYPE_BYTE_GRAY);
for(String file:allFiles)
{
Graphics g = combined.getGraphics();
image = ImageIO.read(new File(folderBase, file));
int h = image.getHeight();
g.drawImage(image, 0, currentHeight, null);
currentHeight += h;
image.flush();
g.dispose();
}
File folderExists = new File(combinedImageLocation + parentFolder + "\\");
if(!folderExists.exists())
{
folderExists.mkdirs();
}
ImageIO.write(combined, "TIFF", new File(combinedImageLocation, (parentFolder + "\\" + currentFile + "Combined.tif")));
combined.flush();
System.gc();*/
}***
public static ArrayList<String> sortFiles(ArrayList<String> allFiles)
{
ArrayList<String> sortedFiles = new ArrayList<String>();
ArrayList<String> numbers = new ArrayList<String>();
ArrayList<String> letters = new ArrayList<String>();
for(String currentFile:allFiles)
{
try
{
Integer.parseInt(currentFile.substring((currentFile.indexOf('.') + 1)));
numbers.add(currentFile);
}catch(Exception e)
{
letters.add(currentFile);
}
}
//String[] numbersArray = new String[numbers.size()];
//String[] lettersArray = new String[letters.size()];
for(int i = 0; i < numbers.size(); i++)
{
sortedFiles.add(numbers.get(i));
}
for(int i = 0; i < letters.size(); i++)
{
sortedFiles.add(letters.get(i));
}
return sortedFiles;
}
}