Develop Reference

Dealing with Adobe CMYK jpegs and Bufferedimage in java

Im trying to apply the code posted in this post:
How to convert from CMYK to RGB in Java correctly?
The Answer from the guy named Codo works for me so far, but my source is not a file, its an object that gets converted into a BufferedImage with
stream = (PRStream)object;
PdfImageObject image = new PdfImageObject(stream);
//this does not work
BufferedImage bi = image.getBufferedImage();
The guy has a method that returns a BufferedImage from a file like so
public BufferedImage readImage(File file) throws IOException, ImageReadException
but i want to use
BufferedImage bi = readImage(image.getBufferedImage());
instead of
File f = new File("/Users/adlib/Documents/projekte/pdf_compress/envirement/eclipse_luna/WORKSPACE/PDFCompression/src/Bild.jpg");
BufferedImage bi = readImage(f);
cause im ectracting all the images from a pdf file using iText.
I messed around with the code (changed file to BufferedImage and added streams) but a just dont get it to work. The File as Input image works fine, but not really what i need. What do i need to change to get This guys code to work with BufferedImage as input for the readImage() method?
Here is the complete code of this guy
https://stackoverflow.com/a/12132630/4944643
He uses Sanselan / Apache Commons Imaging

I'm not sure how iText extracts images, but chances are good it's using ImageIO. If so, you can just install (or depend on, using Maven) the TwelveMonkeys JPEG ImageIO plugin, and
BufferedImage bi = image.getBufferedImage();
...should just work.
The above mentioned plugin does support CMYK (and Adobe YCCK) JPEGs.
If iText doesn't use ImageIO, the above won't work (ie. when you already have a BufferedImage, it's too late to make the correct conversion). You will instead need to get to the bytes of the underlying PDF (using the getImageAsBytes() method), and use ImageIO (via the TwelveMonkeys JPEG plugin) to decode it:
byte[] imgBytes = image.getImageAsBytes();
BufferedImage bi = ImageIO.read(new ByteArrayInputStream(imgBytes));

batik converting two svg to a single pdf

I'm trying to use Batik to do the following task:
I have few set of SVGs graphs, I need to create one .PDF file which basically has some texts followed by a SVG converted graph then few more text followed by another SVG converted graph and so on.
stupidly I tried this but with no surprise the second transcoder gets ignored(no Exception), I'm not sure how to tackle this:
Transcoder transcoder = new PDFTranscoder();
TranscoderInput transcoderInput = new TranscoderInput(new FileInputStream(new File(DESKTOP + "svg1.svg")));
TranscoderInput transcoderInput1 = new TranscoderInput(new FileInputStream(new File(DESKTOP + "svg2.svg")));;
TranscoderOutput transcoderOutput = new TranscoderOutput(new FileOutputStream(new File(DESKTOP+"results.pdf")));
transcoder.transcode(transcoderInput, transcoderOutput);
transcoder.transcode(transcoderInput1, transcoderOutput);
so in short I have two problems:
How to add few SVG into a .PDF?
How to add text along side them?

You can create a new svg with these two svg files side by side or upside down, then convert new svg to .pdf file.
or
if you want to create two svg file as two different pages in a single pdf file, then convert these two svg file to pdf files then merge two pdf files to single pdf file with itext 2.1.7(open source) or ghostscript

What is the difference between using IOUtils and ImageIO for writing an image file

I have a tiff image stored as Base64 encoded String in a file. My aim is to create a tiff file out of it. This is what I am doing:
String base64encodedTiff = IOUtils.toString(new FileInputStream("C:/tiff-attachment.txt"));
byte[] imgBytes = DatatypeConverter.parseBase64Binary(base64encodedTiff);
BufferedImage bufImg = ImageIO.read(new ByteArrayInputStream(imgBytes));
ImageIO.write(bufImg, "tiff", new File("c:/new-darksouls-imageIO-tiff.tiff"));
ImageIO.write() is throwing IllegalArgumentException because bufImg is null. I don't understand what am I doing wrong here.
On the contrary if I use IOUtils to write, it works fine:
IOUtils.write(imgBytes, new FileOutputStream("c:/new-darksouls-io-tiff.tiff"));
Please help me understand
Why ImageIO is throwing exception
What is the right API and way for what I am trying to achieve.

ImageIO would be useful if, for example, you wanted to convert a PNG to a JPEG. Since you don't need to manipulate the image or convert to another format, don't bother with ImageIO. Just use IOUtils.write() to save the TIFF data verbatim.
ImageIO.read() is returning a null image because it can't read the TIFF file, probably because TIFF isn't one of the standard ImageIO plugin formats. The standard supported image formats are listed here:
http://docs.oracle.com/javase/6/docs/api/javax/imageio/package-summary.html
An additional note -- the code you posted buffers the entire image in memory. If you're concerned about using memory efficiently, consider using some kind of Base64 decoding input stream to perform the decoding on the fly. That might look like this:
try (FileOutputStream out = new FileOutputStream("c:/new-darksouls-io-tiff.tiff");
FileInputStream in = new FileInputStream("C:/tiff-attachment.txt");
Base64InputStream decodedIn = new Base64InputStream(in)) {
IOUtils.copy(decodedIn, out);
}

convert a xls file as pdf without poi or jxl

So I summarize my problem. I would like to convert an xls file to PDF, while using java. .
I find two examples
The first is with Openoffice
import officetools.OfficeFile; // from officetools.jar
FileInputStream fis = new FileInputStream(new File("test.doc"));
FileOutputStream fos = new FileOutputStream(new File("test.pdf"));
OfficeFile f = new OfficeFile(fis,"localhost","8100", false);
f.convert(fos,"pdf");
But unfortunately I have to install it :(
I also find this example, two command line with vb (call pdf creator)
DoCmd.OpenReport "repClient", acViewPreview, "NumClient = 2"
DoCmd.OutputTo acOutputReport, "PDF", "d: \ test.pdf"
is there somthing like that on java !!!!
(Note I used for my first solution (jxl, appach poi) but formatting pdf generated is not like when I do save as PDF with Microsoft Excel)
think you in advance

I think you can stream the data from the excel document using
apache POI
library. You can pass this stream of data in
iText library API.
iText library API definitely has a function which writes stream data into PDF file. With iText, you can be sure of pdf formatting as it is widely used in organizations for PDF generation. Infact many reporting tool also use iText to generate PDF reports.

How can i convert *.raw files to *.bmp in JAVA?

BufferedImage image = ImageIO.read( new ByteArrayInputStream( byteArray ) );
ImageIO.write(image, "BMP", new File("filename.bmp"));
When i tried this thing [ImageIO.read( new ByteArrayInputStream( byteArray ))] returns null value so i cant create new bmp file.
But this works to convert jpg to bmp files.I have raw files and i need to convert to image.
Please help me in this.

The support for readers and writers in the javax.imageio is limited, and if you dont know the format of the byte[] your are trying to convert, then propably it is not included in the list of valid image readers. Then, what you might need is the Java Advanced Imaging API, which you can find here.
These are the readers a
Readers: Writers:
bmp bmp
jpg jpg
jpeg jpeg
wbmp Wbmp
png png
gif gif
This few lines shall help you to get this to work using JAI API
// read byte[]
SeekableStream stream = new ByteArraySeekableStream(image);
// render stream of bytes to valid image format
RenderedImage renderedImage = JAI.create("stream", stream);
// persist image to file
JAI.create("filestore", renderedImage, filename, targetFormat);
// dont't forget to close the stream!
stream.close();

Take a look here: Java Advanced Imaging I/O Tools. The Java Image I/O Reader seems to be able to read "raw"-Files. I think that you can write them with the Java Image I/O Writer as BMP.
regards
Macs