There is already question like this link on StackOverflow and the accepted answer is "casting":
Image image = ImageIO.read(new File(file));
BufferedImage buffered = (BufferedImage) image;
In my program I try:
final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = (BufferedImage) image;
Unfortunatelly I get run time error:
sun.awt.image.ToolkitImage cannot be cast to java.awt.image.BufferedImage
Obviously casting does not work.
Question is: What is (or is there) the proper way of converting Image to BufferedImage?
This question is related to
java
image
casting
bufferedimage
From a Java Game Engine:
/**
* Converts a given Image into a BufferedImage
*
* @param img The Image to be converted
* @return The converted BufferedImage
*/
public static BufferedImage toBufferedImage(Image img)
{
if (img instanceof BufferedImage)
{
return (BufferedImage) img;
}
// Create a buffered image with transparency
BufferedImage bimage = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_ARGB);
// Draw the image on to the buffered image
Graphics2D bGr = bimage.createGraphics();
bGr.drawImage(img, 0, 0, null);
bGr.dispose();
// Return the buffered image
return bimage;
}
One way to handle this is to create a new BufferedImage, and tell it's graphics object to draw your scaled image into the new BufferedImage:
final float FACTOR = 4f;
BufferedImage img = ImageIO.read(new File("graphic.png"));
int scaleX = (int) (img.getWidth() * FACTOR);
int scaleY = (int) (img.getHeight() * FACTOR);
Image image = img.getScaledInstance(scaleX, scaleY, Image.SCALE_SMOOTH);
BufferedImage buffered = new BufferedImage(scaleX, scaleY, TYPE);
buffered.getGraphics().drawImage(image, 0, 0 , null);
That should do the trick without casting.
If you use Kotlin, you can add an extension method to Image in the same manner Sri Harsha Chilakapati suggests.
fun Image.toBufferedImage(): BufferedImage {
if (this is BufferedImage) {
return this
}
val bufferedImage = BufferedImage(this.getWidth(null), this.getHeight(null), BufferedImage.TYPE_INT_ARGB)
val graphics2D = bufferedImage.createGraphics()
graphics2D.drawImage(this, 0, 0, null)
graphics2D.dispose()
return bufferedImage
}
And use it like this:
myImage.toBufferedImage()
If you are getting back a sun.awt.image.ToolkitImage
, you can cast the Image to that, and then use getBufferedImage() to get the BufferedImage
.
So instead of your last line of code where you are casting you would just do:
BufferedImage buffered = ((ToolkitImage) image).getBufferedImage();
Source: Stackoverflow.com