How can i export an image to a jpg file?

Question

I have converted a canvas into an image, but I can't find how to export it, I use java fx

Answer 1

Try this:
import javax.imageio.ImageIO;
import javafx.scene.image.WritableImage;
import javafx.embed.swing.SwingFXUtils;
import java.io.File;
....
File file = new File(directoryPath+"test.jpg");
WritableImage writableimage = yourCanvas.snapshot(null);
/* need to remove the alpha channel from the image. It's a bug. Instead of solving it, the library refuses to create a image without the alpha channel. Such as an jpg/JPEG file.
BufferedImage jpgImage = new BufferedImage((int)writableimage.getWidth(), (int)writableimage.getHeight(), BufferedImage.TYPE_INT_RGB);
ImageIO.write(SwingFXUtils.fromFXImage(jpgImage, null),
"jpg", file);