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 ...
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código em JDK 1.4
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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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