Converting an ImageIcon to a BufferedImage

Question

I've been trying to convert a ImageIcon to BufferedImage... And I've had no luck.

I have a pre-existing ImageIcon that needs to be converted to a Buffered Image for the vast amount of BufferedImage operations that exist.

I have found a few ways, but all of them are hugely CPU intensive.

Beiderbecke

Answer 1

What's wrong with:

BufferedImage bi = new BufferedImage(
    icon.getIconWidth(),
    icon.getIconHeight(),
    BufferedImage.TYPE_INT_RGB);
Graphics g = bi.createGraphics();
// paint the Icon to the BufferedImage.
icon.paintIcon(null, g, 0,0);
g.dispose();

Gaspard

Very helpful thank you very much, I had previously came accross this method, but quickly shot it down due to my immiediet assumption that it would perform badly, but after trying it your way, it all seems to work fine. – Beiderbecke

BufferedImage.TYPE_INT_ARGB if there are transparent pixels in the icon. – Toluene

Shouldn't we also do g.setComposite(AlphaComposite.Src) before calling paintIcon to copy all the transparent pixels as is, not as strictly "transparent black"? – Remittance

Answer 2

See ImageIcon, Image and BufferedImage:

ImageIcon yourImage;
Image image = yourImage.getImage();
BufferedImage buffered = (BufferedImage) image;

Phonology

Use this if the ImageIcon contains a BufferedImage, or Werner's answer otherwise. – Hypophyge

That works on Windows but not on Linux (tried on Ubuntu). – Toluene

Answer 3

I tried something called Scalr, view the code below

Scalr.resize((BufferedImage) ImageIO.read(file), Method.SPEED, 250, OP_ANTIALIAS, OP_BRIGHTER);

Cheers.

Yetty

Doesn't answer the OP's question. You're just reading a file, not converting an ImageIcon object to a BufferedImage object – Federalist