How can I display a BufferedImage in a JFrame?

You will have to repaint the JFrame whenever you update the image.

You will have to repaint the JFrame whenever you update the image. Here is what a simple google on the topic brings up: (I use those tutorials for all my Java coding) Java Tutorial: Drawing an Image.

I'm not really sure what you question is but if you have a BufferedImage then you simply create an ImageIcon using the image, then you add the icon to a JLabel and add the label to the GUI like any other component. If you question is about how to create a gray scale, the I suggest you search the web using those terms as the search keywords, I'm sure you will find examples out there.

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