I've found the decision!
it should be
AlphaComposite ac =
AlphaComposite.getInstance(AlphaComposite.SRC);
BufferedImage buffImg = null;
buffImg = ImageIO.read(new File("grid.jpg"));
Graphics2D gbi = buffImg.createGraphics();
gbi.setColor(new Color(1.0f, 0.0f, 0.0f, 1.0f));
gbi.setComposite(ac);
But the question number 2 still remains ...
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