BufferedImage产生黑色输出

Question

BufferedImage for some reason produces black output when I write scaled Image, however Image scales it correctly. I assume here are some problems with painting components. Thank you!

Answer 1

BufferedImage newImage = new BufferedImage(400, 400, BufferedImage.TYPE_INT_RGB);

If putting a PNG or GIF with transparency over it, the transparent parts will become black. It should be:

BufferedImage newImage = new BufferedImage(400, 400, BufferedImage.TYPE_INT_ARGB);

But then, I recommend:

• Only save as JPEG if the original image was JPEG
• Not using an ImageIcon to load an Image , instead use ImageIO to load a BufferedImage .
• Use the buffered image getType() as the parameter instead of BufferedImage.TYPE_..
• Avoid getScaledInstance(..) like the plague , but if using it, specify Image.SCALE_SMOOTH .