jai.create operations

[jai-interest-2]

hello.
i'm newbe to java, so bare with me..
i need to do the following operations:
read tiff file
crop a part of it
change its dpi to 200
resize it to H*W
save it back

what i'v got so far is this base on code from - https://jaistuff.dev.java.net:

    public static void func(String fn, float x,float y,float w,float h) throws IOException
    {
    //read the file
    PlanarImage  input = JAI.create("fileload",fn);
    ParameterBlock pb = new ParameterBlock();
    //set cropping area
        pb.addSource(input);
        pb.add(x);
        pb.add(y);
        pb.add(w);
        pb.add(h);
        //crop the area into new image
        PlanarImage output = JAI.create("crop",pb,null);  
    pb = new ParameterBlock();  
    pb.addSource(output);
    //offset back the image coordinate
    pb.add(-x);  
    pb.add(-y);  
    output = JAI.create("translate",pb,null);  
    // save the image
    JAI.create("filestore",output,"c:\\tost.tif","TIFF");
    // show the image
    JFrame frame = new JFrame();  
    frame.setTitle("Cropping image "+fn+  
                        " starting at ("+x+","+y+"), size "+w+" x "+h);  
    frame.getContentPane().add(new JScrollPane(new DisplayJAI(output)));  
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
    frame.pack();
    frame.setVisible(true);
    }

few questions:
1) the cropping image is shown good on the jframe but when saving the image it get a cropped image but from 0,0 to w,h and not from x,y to w+x,h+y.what is wrong here ??
2) i still need to change DPi and resize it....
3) where do i find all the allowable operation for jai.create (like "crop","fileload","translate" etc.) ?
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[jai-interest-2]

i just checked the same code with jpeg file type and it was saved good, but i need to work with tiff
here's the replace code
    JAI.create("filestore",output,"c:\\tost.jpg","JPEG");
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[jai-interest-2]

> 1) the cropping image is shown good on the jframe but
> when saving the image it get a cropped image but from
> 0,0 to w,h and not from x,y to w+x,h+y.what is wrong
> here ??

The TIFF encoder saves the image in the rectangle [x,y,x+w,y+h]. If I am not mistaken the com.sun.media.jai.codec encoders for all formats should do the same.

> 2) i still need to change DPi and resize it....

Check the archives. Resizing you have to handle yourself. Saving the DPI is a matter of passing the correct TIFFField object to the encoder.

> 3) where do i find all the allowable operation for
> jai.create (like "crop","fileload","translate" etc.) ?

All operations are defined by OperationDescriptor instances in javax.media.jai.operator. See also this example in the jai-demos project:

https://jai-demos.dev.java.net/source/browse/jai-demos/jai-samples/src/OperationRefGuideExample/

I should note that we recommend that you use JAI Image I/O Tools https://jai-imageio.dev.java.net in preference to the codecs in com.sun.media.jai.codec which are used by the Stream/FileLoad/URL/Encode/FileStore operations. JAI Image I/O Tools defines two operations ImageRead/ImageWrite which subsume all the capabilities of the aforementioned JAI operations.

Brian
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