在Java中将图像转换为2色 [英] Convert an image to 2-colour in Java

问题描述

我想使用Java将图像转换为2色，黑色和白色。我使用以下代码转换为灰度：

I would like to convert an image to 2-color, black and white using Java. I'm using the following code to convert to grayscale:

    ColorConvertOp op = new ColorConvertOp(
             ColorSpace.getInstance(ColorSpace.CS_GRAY), null);
    BufferedImage grayImage = op.filter(image, null);

但我不知道如何修改它以转换为黑白。

But I'm not sure how to modify this to convert to just black and white.

推荐答案

基于另一个答案（产生灰度）：

Based on another answer (that produced grayscale):

public static BufferedImage toBinaryImage(final BufferedImage image) {
    final BufferedImage blackAndWhiteImage = new BufferedImage(
            image.getWidth(null), 
            image.getHeight(null), 
            BufferedImage.TYPE_BYTE_BINARY);
    final Graphics2D g = (Graphics2D) blackAndWhiteImage.getGraphics();
    g.drawImage(image, 0, 0, null);
    g.dispose();
    return blackAndWhiteImage;
}

你不能用 ColorConvertOp 因为没有二进制颜色空间。

You cannot do it with ColorConvertOp because there is not binary colorspace.

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