Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
1.4k views
in Technique[技术] by (71.8m points)

java - How to use TYPE_BYTE_GRAY to efficiently create a grayscale bufferedimage using AWT

I need to create a grayscale image from data in an nio ShortBuffer. I have a function that maps the data in the ShortBuffer to unsigned byte but is in an int (easily changed). The method I found uses an RGB plus transparency color model and appears to be quite inefficent. i have not been able to see how to apply the TYPE_BYTE_GRAY and modify the code. i'm new to Java. Here's my code:

    public void paintComponent(Graphics g) {
    final BufferedImage image;
    int[] iArray = {0, 0, 0, 255};  //  pixel

    image = (BufferedImage) createImage(WIDTH, HEIGHT);

    WritableRaster raster = image.getRaster();
    sBuf.rewind();  // nio ShortBuffer
    for (int row = 0; row < HEIGHT; row++) {
        for (int col = 0; col < WIDTH; col++) {
            int v = stats.mapPix(sBuf.get());  // map short to byte
            iArray[0] = v;  // RGBT
            iArray[1] = v;  
            iArray[2] = v;
            raster.setPixel(col, row, iArray);
        }
    }
    g.drawImage(image, 0, 0, getWidth(), getHeight(), null);
}

TIA Nate

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Answer

0 votes
by (71.8m points)

One approach would be to create the BufferedImage by writing to the raster as you are doing now. Once you have the BufferedImage, you can convert it to TYPE_BYTE_GRAY using the filter() method of ColorConvertOp, as shown in this example.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome to OStack Knowledge Sharing Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...