I’ve got here 2 gifs, identical in every way, except the bitmask color is at index 0 in image B, and index 12 in image A.
Image B loads fine, Image A appears to load fine.
However, when I apply a rotation tranform to it during drawing, I get an ugly opaque band across the top few rows of the image ???
The color of the band is dependant on the color at palette entry 0 :S
And yes, I am absolutely positive it is not my code 
here are the 2 images
Image a =
Image b =
and the results of rotating the 2 images (using the same code) :-
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
import javax.imageio.*;
import javax.swing.*;
public class GifTest extends JFrame
{
BufferedImage a,b;
public GifTest()
{
setDefaultCloseOperation(EXIT_ON_CLOSE);
try
{
a = ImageIO.read(getClass().getResource("broken.gif"));
b = ImageIO.read(getClass().getResource("fixed.gif"));
}
catch(Exception e){}
}
public void paint(Graphics g)
{
Graphics2D g2d = (Graphics2D)g;
AffineTransform af = AffineTransform.getRotateInstance(Math.PI/4, 50,50);
g2d.setTransform(af);
g2d.drawImage(a,50,50,null);
AffineTransform af2 = AffineTransform.getRotateInstance(Math.PI/4, 150,50);
g2d.setTransform(af2);
g2d.drawImage(b,150,50,null);
}
public static void main(String [] args)
{
GifTest gf = new GifTest();
gf.setBounds(50,50,300,300);
gf.show();
}
}
The answer is an emphatic “yes”. We just completed that work a couple weeks ago, so that all BufferedImages (even those returned by ImageIO) can now be considered “managed images”. Of course, it’s still best (as always) to use GraphicsConfig.createCompatibleImage() so that we pick the most optimal format for your device. But at least now you don’t have to go through trickery to get your IIO images “managed”, as we take care of that for you under the hood.