Java implementation of high quality image zooming class definition and usage examples

This article illustrates the definition and usage of Java's image high quality zoom class. To share for your reference, the details are as follows:

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package com.test;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import javax.swing.*;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.Kernel;
import java.awt.image.ConvolveOp;
public class ImageUtil {
  public static void resize(File originalFile, File resizedFile,
      int newWidth, float quality) throws IOException {
    if (quality > 1) {
      throw new IllegalArgumentException(
          "Quality has to be between 0 and 1");
    }
    ImageIcon ii = new ImageIcon(originalFile.getCanonicalPath());
    Image i = ii.getImage();
    Image resizedImage = null;
    int iWidth = i.getWidth(null);
    int iHeight = i.getHeight(null);
    if (iWidth > iHeight) {
      resizedImage = i.getScaledInstance(newWidth, (newWidth * iHeight)
          / iWidth, Image.SCALE_SMOOTH);
    } else {
      resizedImage = i.getScaledInstance((newWidth * iWidth) / iHeight,
          newWidth, Image.SCALE_SMOOTH);
    }
    // This code ensures that all the pixels in the image are loaded.
    Image temp = new ImageIcon(resizedImage).getImage();
    // Create the buffered image.
    BufferedImage bufferedImage = new BufferedImage(temp.getWidth(null),
        temp.getHeight(null), BufferedImage.TYPE_INT_RGB);
    // Copy image to buffered image.
    Graphics g = bufferedImage.createGraphics();
    // Clear background and paint the image.
    g.setColor(Color.white);
    g.fillRect(0, 0, temp.getWidth(null), temp.getHeight(null));
    g.drawImage(temp, 0, 0, null);
    g.dispose();
    // Soften.
    float softenFactor = 0.05f;
    float[] softenArray = { 0, softenFactor, 0, softenFactor,
        1 - (softenFactor * 4), softenFactor, 0, softenFactor, 0 };
    Kernel kernel = new Kernel(3, 3, softenArray);
    ConvolveOp cOp = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
    bufferedImage = cOp.filter(bufferedImage, null);
    // Write the jpeg to a file.
    FileOutputStream out = new FileOutputStream(resizedFile);
    // Encodes image as a JPEG data stream
    JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
    JPEGEncodeParam param = encoder
        .getDefaultJPEGEncodeParam(bufferedImage);
    param.setQuality(quality, true);
    encoder.setJPEGEncodeParam(param);
    encoder.encode(bufferedImage);
  } // Example usage
  public static void main(String[] args) throws IOException {
//    File originalImage = new File("C:\\11.jpg");
//    resize(originalImage, new File("c:\\11-0.jpg"),150, 0.7f);
//    resize(originalImage, new File("c:\\11-1.jpg"),150, 1f);
     File originalImage = new File("C:\\1207.gif");
     resize(originalImage, new File("c:\\1207-0.jpg"),150, 0.7f);
     resize(originalImage, new File("c:\\1207-1.jpg"),150, 1f);
  }
}

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