ImageIOがargbを使ってjpgを操作するバグについて話します.

順序
本論文では主にImageIOを使ってBufferedImage.TYPE_INT_ARGBモードでjpgを操作すると、黒いbugが表示されます.
bug

JDK-471277:ImageIO fails to decode YCbCr JPEGs that do not have a JFIF maker

JDK-4776576:REG:ImageIO reader produces an incorectイメージwhen read as a RenderedImage

実例をふくげんする

public void testArgbOnJpg() throws IOException {
        int width = 400;
        int height = 400;
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = image.createGraphics();
        g2.setColor(Color.WHITE);
        g2.fillRect(0, 0, width, height);
        g2.setComposite(AlphaComposite.Src);
        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        
        g2.setColor(Color.RED);
        Ellipse2D.Float shape = new Ellipse2D.Float(20, 20, 10, 10);
        g2.fill(shape);

        g2.dispose();
        image.flush();

        ImageIO.write(image,"jpg",new File("out.jpg"));
    }

出力された画像のブラックスクリーンが見つかります.
修復

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

jpgの場合、BufferedImage.TYPE_に変更します.INT_RGB、正常に表示できます.
doc

Colors appar wrong in image file type is TYPEINT_ARGB and writing with ImageIO

jpegイメージカラートレッキングchanged after just ImageIO.read()and ImageIO.write()