Wednesday, March 25, 2009

Image compressor

Found this piece of code on www.coderanch.com

package com;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageTypeSpecifier;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;
import javax.imageio.stream.ImageOutputStream;

public class ImageCompression
{
public static void main(String[] args) throws IOException
{
Iterator writers;
BufferedImage bufferedImage;
ImageOutputStream imageOutputStream;
ImageWriter imageWriter;
ImageWriteParam pngparams;
// Read an image from the disk (First Argument)
// bufferedImage = ImageIO.read(new File(args[0]));
bufferedImage = ImageIO.read(new File("C:\\DSC0009111370.JPG"));
// Get all the PNG writers
writers = ImageIO.getImageWritersByFormatName("jpg");
// Fetch the first writer in the list
imageWriter = (ImageWriter) writers.next();
// Just to confirm that the writer in use is CLibPNGImageWriter
System.out.println("\n Writer used : " + imageWriter.getClass().getName() + "\n");
// Specify the parameters according to those the output file will be
// written
// Get Default parameters
pngparams = imageWriter.getDefaultWriteParam();
// Define compression mode
pngparams.setCompressionMode(javax.imageio.ImageWriteParam.MODE_EXPLICIT);
// Define compression quality
pngparams.setCompressionQuality(0.5F);
// Define progressive mode
pngparams.setProgressiveMode(javax.imageio.ImageWriteParam.MODE_COPY_FROM_METADATA);
// Deine destination type - used the ColorModel and SampleModel of the
// Input Image
pngparams.setDestinationType(new ImageTypeSpecifier(bufferedImage.getColorModel(), bufferedImage
.getSampleModel()));
// Set the output stream to Second Argument
// imageOutputStream = ImageIO.createImageOutputStream( new
// FileOutputStream(args[1]) );
imageOutputStream = ImageIO.createImageOutputStream(new FileOutputStream("C:\\new_test.jpg"));
imageWriter.setOutput(imageOutputStream);
// Write the changed Image
imageWriter.write(null, new IIOImage(bufferedImage, null, null), pngparams);
// Close the streams
imageOutputStream.close();
imageWriter.dispose();
}
}

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