javafx quality of the images uploaded - mysql

Question

my application connects to a database in mysql using phpmyadmin and stores an image in the database, but my problem is when I download the image from the database and post the image on a imageview the image has a very low quality where also it's color is being afected too.
if I post the image directly on the database using phpmyadmin and then download the image using my app the image looks fine, but if I upload the image from my app and then i download it then the quality is bad.
the way to post the image is past the image to a byte[] and then uploading to the database that uses the type blob.
private byte[] imagenToByte(Image imagen) {
BufferedImage bufferimage = SwingFXUtils.fromFXImage(imagen, null);
ByteArrayOutputStream output = new ByteArrayOutputStream();
try {
ImageIO.write(bufferimage, "jpg", output );
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte [] data = output.toByteArray();
return data;
}
can you help me please?
EDIT
#FXML
public void eventoBotonSeleccionarImagen() {
FileChooser imagenSeleccionada = new FileChooser();
FileChooser.ExtensionFilter filtroImagenjpg = new ExtensionFilter("Archivos *.jpg", "*.jpg");
FileChooser.ExtensionFilter filtroImagenJPG = new ExtensionFilter("Archivos *.JPG", "*.JPG");
File archivo = imagenSeleccionada.showOpenDialog(null);
try {
BufferedImage bufferedImage = ImageIO.read(archivo);
Image image = SwingFXUtils.toFXImage(bufferedImage, null);
imageViewMonstruo.setImage(image);
}
catch(Exception e) {
e.printStackTrace();
}
}

Answer 1

I found the answer to the question thanks to this
this question.
What I've done is changing from Blob to longblob in the database and adding png instead of jpg, the code result is this
private byte[] imagenToByte(Image imagen) {
BufferedImage bufferimage = SwingFXUtils.fromFXImage(imagen, null);
ByteArrayOutputStream output = new ByteArrayOutputStream();
try {
ImageIO.write(bufferimage, "png", output );
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
byte [] data = output.toByteArray();
return data;
}
And finally it upload and download the images with the same quality