Not sure if this helps but here's another conversion program in Java which:
- uses AWT but not the toolkit part
- supports GIFs
- is relatively smart about keep the x/y ratio
- would need a little conversion to work in memory without writing to/from
disk
Per Kreipke
P.s. Can't remember where I found portions of this code snippet so I can't
give credit where credit is due, my apologies to the original author.
package org.onclave.util;
import java.awt.Image;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.io.FileOutputStream;
import javax.swing.ImageIcon;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class Thumbnail
{
public static void main(String[] args)
{
System.out.print("starting...\n");
createThumbnail(args[0], args[1], Integer.parseInt(args[2]));
System.out.print("finished.\n");
System.exit(0);
}
/**
* Reads an image in a file and creates
* a thumbnail in another file.
* @param orig The name of image file.
* @param thumb The name of thumbnail file.
* Will be created if necessary.
* @param maxDim The width and height of
* the thumbnail must
* be maxDim pixels or less.
*/
public static void createThumbnail(String orig, String thumb, int
maxDim)
{
try
{
// Get the image from a file.
Image inImage = new ImageIcon(orig).getImage();
// Determine the scale.
double scale = (double)maxDim / (double)
inImage.getHeight(null);
if (inImage.getWidth(null) > inImage.getHeight(null))
{
scale = (double)maxDim / (double) inImage.getWidth(null);
}
// Determine size of new image.
// One of them should equal maxDim.
int scaledW = (int)(scale * inImage.getWidth(null));
int scaledH = (int)(scale * inImage.getHeight(null));
// Create an image buffer in which to paint on.
BufferedImage outImage = new BufferedImage(scaledW, scaledH,
BufferedImage.TYPE_INT_RGB);
// Set the scale.
AffineTransform tx = new AffineTransform();
// If the image is smaller than the desired image size,
// don't bother scaling.
if (scale < 1.0d)
{
tx.scale(scale, scale);
}
// Paint image.
Graphics2D g2d = outImage.createGraphics();
g2d.drawImage(inImage, tx, null);
g2d.dispose();
// JPEG-encode the image and write to file.
OutputStream os = new FileOutputStream(thumb);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
encoder.encode(outImage);
os.close();
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
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