Hi.
I am writing an Applet for viewing large (~2600x3500) tiff files. Here is my
scaling method
public static BufferedImage getScaledInstance( Image img, int targetWidth,
int targetHeight, Object hint, boolean higherQuality ) {
long startTime = System.currentTimeMillis();
BufferedImage ret = null;
int w, h;
if (higherQuality) {
// Use multi-step technique: start with original size, then
// scale down in multiple passes with drawImage()
// until the target size is reached
w = img.getWidth(null);
h = img.getHeight(null);
} else {
// Use one-step technique: scale directly from original
// size to target size with a single drawImage() call
w = targetWidth;
h = targetHeight;
}
do {
if (higherQuality && w > targetWidth) {
w /= 2;
if (w < targetWidth) {
w = targetWidth;
}
}
if (higherQuality && h > targetHeight) {
h /= 2;
if (h < targetHeight) {
h = targetHeight;
}
}
ret = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics2D g2 = ret.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, hint);
g2.drawImage(img, 0, 0, w, h, null);
g2.dispose();
} while (w != targetWidth || h != targetHeight);
long stopTime = System.currentTimeMillis();
long runTime = stopTime - startTime;
System.out
.println("Run time: getScaledInstance() : " + runTime + " ms");
return ret;
}
If I use ImageIO to read the tiff file as a BufferedImage and pass it as a
source image to method, It takes ~1600ms to scale it down to ~800x600. But if I
use Jimi.getImage() and get the image as a java.awt.Image type and pass in
method, it takes ~800ms to scale.
I wonder why bufferedimage is slower. I want to use ImageIO instead of Jimi as
it supports more formats, it comes with default Jdk and Jimi seems old
framework. But as I said, if I use ImageIO, I get a BufferedImage that scales
slower.
And I wonder if I learn and use VolatileImage, should it be faster or I will no
effect for my purpose.
Thanks and sorry for my bad english.
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