Strange Image when Saving

Question

Hi.
I make my image
image1.getGraphics().drawImage(top, 50, 100, null);
image1.getGraphics().drawImage(right, 250,100, null);
image1.getGraphics().drawImage(front, 50,200,200,200, null);
myPannel.setImage(elaboraImmagini());
myPannel.repaint();I see the image perfect in my pannell but when i Save i have a different image colour!!!
Why!!!
Strange colour
whyte ----> Pink
black -----> blue
i save with this code
ImageIO.write(image1,ext,f);Why I see normal and save strange??
Please help!

Answer 1

My guess is that your issues lies with transparency. Depending on what type of image "image1" is, it may or may not support transparency. PNG supports a full alpha channel, but JPG does not support transparency at all. So if drawing a transparent image onto a medium that does not support it, you'll find your background become whatever the original pixels would read assuming opaque alpha values.
That was just to let you know why you're seeing this. The simple solution is to preceed your image draws with a fillRect of the desired background color. So if you want a black background:
Graphics imageG = image1.getGraphics();
imageG.setColor(Color.BLACK);
imageG.fillRect(0, 0, image1Width, image1Height);
imageG.drawImage(top, 50, 100, null);
imageG.drawImage(right, 250,100, null);
imageG.drawImage(front, 50,200,200,200, null);This ensures all pixels of your image are opaque and thus can be saved onto mediums which do not support transparency such as JPG.