How to set the transparency for a image

Question

Hi
iam reading and writing and GIF image,when i resize the new image
the transparency of the old image is not applied to the new one it appears black as background. so i need to set the transparency of the old image to the new GIF image . so is there any function to set the tranparency or any sample code....

Answer 1

hi
Image image = Toolkit.getDefaultToolkit().getImage(logoFilePath);
image.getScaledInstance(200,150,Image.SCALE_SMOOTH);
MediaTracker mediaTracker = new MediaTracker(new Container());
mediaTracker.removeImage(image);
mediaTracker.addImage(image,
0);
mediaTracker.waitForID(0);
// determine thumbnail size from WIDTH and HEIGHT
int thumbWidth = Integer.parseInt("200");
int thumbHeight = Integer.parseInt("150");
double thumbRatio = (double) thumbWidth / (double) thumbHeight;
int imageWidth = image.getWidth(null);
int imageHeight = image.getHeight(null);
double imageRatio = (double) imageWidth / (double) imageHeight;
int transparency = Integer.parseInt("100");
if (thumbRatio < imageRatio)
thumbHeight = (int) (thumbWidth / imageRatio);
else
thumbWidth = (int) (thumbHeight * imageRatio);
if (imageWidth < thumbWidth && (imageHeight < thumbHeight))
thumbHeight = imageHeight;
thumbWidth = imageWidth;
// draw original image to thumbnail image object and
BufferedImage thumbImage = new BufferedImage(thumbWidth, thumbHeight, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics2D = thumbImage.createGraphics();
graphics2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BILINEAR);
graphics2D.drawImage(image, 0, 0, thumbWidth, thumbHeight, null);
// save thumbnail image to OUTFILE
out = new BufferedOutputStream(new FileOutputStream(newFilePath));
GifEncoder gife = new GifEncoder(thumbImage,out);
gife.encode();