I have been following some StackOverflow links using Graphics2D to change the background color of a BufferedImage.
The project I am working on requires that I read in a png image from a given url; the png image retrieved has a transparent background, and I would like to set it to white.
Here is what I have:
String u = this.format() ;
BufferedImage image = null ;
try{
URL url = new URL(u) ;
image = ImageIO.read(url) ;
Graphics2D graphics = image.createGraphics() ;
graphics.setBackground(Color.WHITE) ;
graphics.clearRect(0, 0, image.getWidth(), image.getHeight()) ;
ImageIO.write(image, "png", new File(outPath + fileName)) ;
graphics.dispose() ;
}
catch(IOException e){
e.printStackTrace() ;
}
The problem I am running into is that when I view the image, the image appears as a solid white box. Apparently I have overlaid a white background on top of the existing image that I retrieved.
How can I preserve the original image and only change the background? Or set the background first and then overlay the retrieved image?
1- Load your image
image = ImageIO.read(url) ;
2- Create a new BufferedImage of the same size
BufferedImage background = new BufferedImage(image.getWidth(), image.getHeight, BufferedImage.TYPE_INT_RGB);
3- Fill the background image with the desired color
Graphics2D g2d = background.createGraphics();
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, background.getWidth(), background.getHeight());
4- Draw the original image onto the background...
g2d.drawImage(image, 0, 0, null);
g2d.dispose();
background is now filled with the desired color and has the image painted on top o it.