Buffered Image and Pixel Manipulation question
Can anyone give me a good example of how to load an image as a BufferedImage. I've been looking for a solid week or so, but nowhere gives a good example. I'm trying to avoid swing and like using 8 other objects before I convert to BufferedImage.
Also once I have my buffered image, I want to get all pixels that are a particular color and make them transparent (this way I can keep my images as a bitmap and create the transparency myself!)
Thanks!
[469 byte] By [
untwisteda] at [2007-9-29 14:22:20]
This is a method I learned from Abuse a while ago (you can ignore/take out the logging info etc..)
public BufferedImage loadImage(String path) {
Log.getInstance().printDebug("Loading image " + path);
try {
Image preImage =javax.imageio.ImageIO.read(
getClass().getResource(path));
GraphicsConfiguration gc = window.getGraphicsConfiguration();
/**createas a fully accelerated image*/
BufferedImage toReturn = gc.createCompatibleImage(
preImage.getWidth(null),
preImage.getHeight(null),
Transparency.TRANSLUCENT);
Graphics2D toReturnG = (Graphics2D) toReturn.getGraphics();
toReturnG.setComposite(AlphaComposite.Src);
toReturnG.drawImage(preImage, 0, 0, null);
toReturnG.dispose();
return toReturn;
} catch (Exception e) {
Log.getInstance().printException(e,
"Error loading image, check path");
return null;
}
} //end loadImage
static final int TRANSPARENCY_COLOR = 0xFF00FF; //the usual pink used to indicate transparency
static final String IMAGE_NAME = "blahblah.blah";
....
BufferedImage bi = javax.imageio.ImageIO.read(getClass().getResource(IMAGE_NAME));
for(int x = 0;i < bi.getWidth();x++)
{
for(int y = 0;y<bi.getHeight();y++)
{
int argb = bi.getRGB(x,y);
if((argb&0xFFFFFF)==TRANSPARENCY_COLOR) bi.setRGB(x,y,0);
}
}
This will probably do what you want.
However I recommend against it. It is far more efficient to store the transparency within the image.
note.
You will subsequently need to copy the BufferedImage returned from ImageIO into a BufferedImage returned from graphicsConfiguration.createCompatibleImage(...) for it to be acceleratable.>
