Question

我找了一种简单的方法用Java调色图像，但我找不到任何适合我需要的东西。我采用了以下解决方案：

首先创建一个新图像，作为我想要着色的图像的副本，然后我创建第二个图像，它是我想要着色的图像的透明蒙版，然后在我的副本上绘制色调 - 蒙版返回副本：

public static BufferedImage tintImage(Image original, int r, int g, int b){
    int width = original.getWidth(null);
    int height = original.getHeight(null);
    BufferedImage tinted = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
    Graphics2D graphics = (Graphics2D) tinted.getGraphics();
    graphics.drawImage(original, 0, 0, width, height, null);
    Color c = new Color(r,g,b,128);
    Color n = new Color(0,0,0,0);
    BufferedImage tint = new BufferedImage(width, height, BufferedImage.TRANSLUCENT);
    for(int i = 0 ; i < width ; i++){
        for(int j = 0 ; j < height ; j++){
            if(tinted.getRGB(i, j) != n.getRGB()){
                tint.setRGB(i, j, c.getRGB());
            }
        }
    }
    graphics.drawImage(tint, 0, 0, null);
    graphics.dispose();
    return tinted;
}

没有透明像素的图像解决方案（例如没有使用alpha通道）只是在整个图像上使用fillRect（），但这对于具有透明像素的图像不起作用有选择的颜色，而不是仍然不可见。

有没有人知道如何更有效地做到这一点，因为我在这里找到的方法相当不满意，我打算对许多图像进行这种着色（大多数图像都有灰色调，因此它们很容易被着色）运行时间约为每秒50次。

预先生成启动时生成所有需要的图像和/或缓存生成的图像可能是一种解决方案，但在某些方面对我来说感觉很尴尬，但如果不能做任何事情就可以做任何事情。

有人联系到了这一点：http://www.javalobby.org/articles/ultimate-image/

这很有帮助，但没有涵盖着色。

Answer 1

基本上，你需要使用一点黑魔法，手头上有一两个牺牲也不会有什么伤害......

enter image description here

public class TestTint {

    public static void main(String[] args) {
        new TestTint();
    }

    public TestTint() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public static GraphicsConfiguration getGraphicsConfiguration() {
        return GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
    }

    public static BufferedImage createCompatibleImage(int width, int height, int transparency) {
        BufferedImage image = getGraphicsConfiguration().createCompatibleImage(width, height, transparency);
        image.coerceData(true);
        return image;
    }

    public static void applyQualityRenderingHints(Graphics2D g2d) {
        g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
        g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
        g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
        g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
        g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
        g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
        g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
    }

    public static BufferedImage generateMask(BufferedImage imgSource, Color color, float alpha) {
        int imgWidth = imgSource.getWidth();
        int imgHeight = imgSource.getHeight();

        BufferedImage imgMask = createCompatibleImage(imgWidth, imgHeight, Transparency.TRANSLUCENT);
        Graphics2D g2 = imgMask.createGraphics();
        applyQualityRenderingHints(g2);

        g2.drawImage(imgSource, 0, 0, null);
        g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_IN, alpha));
        g2.setColor(color);

        g2.fillRect(0, 0, imgSource.getWidth(), imgSource.getHeight());
        g2.dispose();

        return imgMask;
    }

    public BufferedImage tint(BufferedImage master, BufferedImage tint) {
        int imgWidth = master.getWidth();
        int imgHeight = master.getHeight();

        BufferedImage tinted = createCompatibleImage(imgWidth, imgHeight, Transparency.TRANSLUCENT);
        Graphics2D g2 = tinted.createGraphics();
        applyQualityRenderingHints(g2);
        g2.drawImage(master, 0, 0, null);
        g2.drawImage(tint, 0, 0, null);
        g2.dispose();

        return tinted;
    }

    public class TestPane extends JPanel {

        private BufferedImage master;
        private BufferedImage mask;
        private BufferedImage tinted;

        public TestPane() {
            try {
                master = ImageIO.read(new File("C:/Users/swhitehead/Documents/My Dropbox/MegaTokyo/Miho_Small.png"));
                mask = generateMask(master, Color.RED, 0.5f);
                tinted = tint(master, mask);
            } catch (IOException exp) {
                exp.printStackTrace();
            }
        }

        @Override
        public Dimension getPreferredSize() {
            Dimension size = super.getPreferredSize();
            if (master != null && mask != null) {
                size = new Dimension(master.getWidth() + mask.getWidth() + tinted.getWidth(), Math.max(Math.max(master.getHeight(), mask.getHeight()), tinted.getHeight()));
            }
            return size;
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            int x = (getWidth() - (master.getWidth() + mask.getWidth() + tinted.getWidth())) / 2;
            int y = (getHeight() - master.getHeight()) / 2;
            g.drawImage(master, x, y, this);

            x += mask.getWidth();
            y = (getHeight() - mask.getHeight()) / 2;
            g.drawImage(mask, x, y, this);

            x += tinted.getWidth();
            y = (getHeight() - tinted.getHeight()) / 2;
            g.drawImage(tinted, x, y, this);
        }

    }

}

这种技术背后的一般想法是生成图像的“面具”，我不相信这个想法，我偷了它的网页，如果我能找到哪里，我会发布链接。

一旦有了面具，就可以将两个图像一起渲染。因为我已经在面具上应用了alpha级别，所以在完成后我不需要重新应用alpha合成。

PS - 我为此示例创建了兼容的图像。我这样做只是因为它会在图形设备上渲染得更快，这不是必需的，它只是我手边的代码;）

在Java改进中着色图像

1 个答案: