shrink Image - Java 2D Graphics

Java examples for 2D Graphics:Image

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Description

shrink Image

Demo Code


//package com.java2s;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriteParam;
import javax.imageio.ImageWriter;

public class Main {
    public static byte[] shrinkImage(BufferedImage originalImage,
            double scale, float compression) {

        int newW = (int) (originalImage.getWidth() * scale);
        int newH = (int) (originalImage.getHeight() * scale);
        BufferedImage resizedImage = new BufferedImage(newW, newH,
                originalImage.getType());
        Graphics2D g = resizedImage.createGraphics();
        g.drawImage(originalImage, 0, 0, newW, newH, null);
        g.dispose();//  ww w. j  av a2 s  .c om
        ImageWriter writer = (ImageWriter) ImageIO.getImageWritersBySuffix(
                "jpeg").next();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        try {
            writer.setOutput(ImageIO.createImageOutputStream(out));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(compression); //half
        try {
            writer.write(null, new IIOImage(resizedImage, null, null),
                    param);
            return out.toByteArray();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return null;
    }
}

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