Java ImageIO API with PNG image compression

[nek thomas]

Hello people

I need your help for program related to ImageIO API while working on PNG images.


Here is the code,

import java.io.*;
import java.util.*;
import java.awt.image.*;
import javax.imageio.*;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.plugins.jpeg.JPEGImageWriteParam;
import com.sun.media.imageioimpl.plugins.png.*; // had to comment this as this package does not exist
//import com.sun.imageio.plugins.png;

public class TestWriter
{
public static void main(String[] args)
throws IOException
{
/*
if (args.length < 2) {
// Exit if both the arguments (Input File and Output File) are not provided
System.err.println("Usage: java TestWriter c:\\in.png c:\\out.png");
return;
}
*/
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("Download.png"));
// Get all the PNG writers
writers = ImageIO.getImageWritersByFormatName( "png" );

// 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("PNGCopy.png") );
imageWriter.setOutput( imageOutputStream );

// Write the changed Image
imageWriter.write( null, new IIOImage( bufferedImage, null, null ), pngparams );

// Close the streams
imageOutputStream.close();
imageWriter.dispose();
}
}




And, I get the following exception, package com.sun.media.imageioimpl.plugins.png does not exist



Please guide me if I need to add specific JARs to use this code involving PNG images.





Thanks


Nek

[Ulf Dittmer]

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Let's continue the discussion in this duplicate thread.