[java-list] =?iso-8859-1?Q?Convers=E3o_de_JPG_para_GIF_ou_PNG_com_altera=E7=E3o_de_ta?==?iso-8859-1?Q?manho?=

Wed, 10 Jul 2002 10:48:10 -0700

Alguém pode me ajudar???
 
O problema é o seguinte:
Quero pegar uma imagem JPG, diminuir o seu tamanho e gravá-la como GIF ou PNG ...
(gerar um thumbnail)
 
Porfavor, quem puder me mandar as alterações necessárias para que funcione a classe abaixo ou se alguém tem um código mais sucinto ...
 
------------------------------------------------------------------------------------------------
código em JDK 1.4
------------------------------------------------------------------------------------------------
 
package kk.test;
 
import java.io.*;
import java.awt.*;
import javax.swing.ImageIcon;
import java.awt.image.*;
import javax.imageio.*;
 
public class Test {
 
    public static void main(String[] args) throws Exception {
        File file = null;
 
        file = new File("c:\\documents and settings\\diegodsp\\desktop\\01.jpg");
        BufferedImage bi = ImageIO.read(file);
 
        Image image = toImage(bi);
        System.out.println(image.getWidth(null) + "x" + image.getHeight(null));
        image = image.getScaledInstance(300, 300, image.SCALE_FAST);
        System.out.println(image.getWidth(null) + "x" + image.getHeight(null));
        bi = toBufferedImage(image);
 
        File fileOut = new File("c:\\documents and settings\\diegodsp\\desktop\\01.png");
        ImageIO.write(bi, "png", fileOut);
 
        System.out.println("foi");
    }
 
    // This method returns an Image object from a buffered image
    public static Image toImage(BufferedImage bufferedImage) {
        return Toolkit.getDefaultToolkit().createImage(bufferedImage.getSource());
    }
 
    // This method returns a buffered image with the contents of an image
    public static BufferedImage toBufferedImage(Image image) {
        if (image instanceof BufferedImage) {
            return (BufferedImage)image;
        }
 
        // This code ensures that all the pixels in the image are loaded
        image = new ImageIcon(image).getImage();
 
        // Determine if the image has transparent pixels; for this method's
        // implementation, e660 Determining If an Image Has Transparent Pixels
        boolean hasAlpha = hasAlpha(image);
 
        // Create a buffered image with a format that's compatible with the screen
        BufferedImage bimage = null;
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        try {
            // Determine the type of transparency of the new buffered image
            int transparency = Transparency.OPAQUE;
            if (hasAlpha) {
                transparency = Transparency.BITMASK;
            }
 
            // Create the buffered image
            GraphicsDevice gs = ge.getDefaultScreenDevice();
            GraphicsConfiguration gc = gs.getDefaultConfiguration();
            bimage = gc.createCompatibleImage(
                image.getWidth(null), image.getHeight(null), transparency);
        } catch (HeadlessException e) {
            // The system does not have a screen
        }
 
        if (bimage == null) {
            // Create a buffered image using the default color model
            int type = BufferedImage.TYPE_INT_RGB;
            if (hasAlpha) {
                type = BufferedImage.TYPE_INT_ARGB;
            }
            bimage = new BufferedImage(image.getWidth(null), image.getHeight(null), type);
        }
 
        // Copy image to buffered image
        Graphics g = bimage.createGraphics();
 
        // Paint the image onto the buffered image
        g.drawImage(image, 0, 0, null);
        g.dispose();
 
        return bimage;
    }
 
    // This method returns true if the specified image has transparent pixels
    public static boolean hasAlpha(Image image) {
        // If buffered image, the color model is readily available
        if (image instanceof BufferedImage) {
            BufferedImage bimage = (BufferedImage)image;
            return bimage.getColorModel().hasAlpha();
        }
 
        // Use a pixel grabber to retrieve the image's color model;
        // grabbing a single pixel is usually sufficient
         PixelGrabber pg = new PixelGrabber(image, 0, 0, 1, 1, false);
        try {
            pg.grabPixels();
        } catch (InterruptedException e) {
        }
 
        // Get the image's color model
        ColorModel cm = pg.getColorModel();
        return cm.hasAlpha();
    }
 
}

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