The Big Programming Thread - Page 279

On March 31 2013 12:32 phar wrote:
This may be of assistance:

http://docs.oracle.com/javase/6/docs/api/java/awt/image/BufferedImage.html#getRGB(int, int, int, int, int[], int, int)
http://stackoverflow.com/questions/6001211/format-of-type-int-rgb-and-type-int-argb

Recall that an int in java is 32 bits. Look at this like 4 bytes:

10101010 | 10101010 | 10101010 | 10101010

With TYPE_INT_ARBG, you get 4 bytes, a (alpha), r (red), b (blue), g (green) in order. So you get 8 bits of each color, and 8 bits of alpha:

aaaaaaaa | rrrrrrrr | bbbbbbbb | gggggggg

I don't know how you're defining average color, but presumably you want to separate out the r, b, and g portions (dunno if you care about alpha).

You're going to have to learn how to do bit shifting 'n shit for that, unless BufferedImage has helper methods. See if you can dig up helper methods for dealing with TYPE_INT_ARBG. If not, have fun with the >> & bullshit


Also this may be one of those things that gets fucked up on big vs. little endian, but probably not if you're only using java. I think java may be stuck at big endian regardless of your comp's architecture. Perhaps.

for(int y = 0; y < height - 54; y += 53) {
            for(int x = 0; x < width - 72; x += 71) {
               
                img.getSubimage(x, y, 71, 53).getRGB(
                                0, 0, 71, 53, samples, 0, 71);

                for(int i = 0; i < samples.length - 1; i++) {
                    colorSum += samples[i];
                    System.out.println(samples[i]);
                }

                for(int i = 0; i < samples.length - 1; i++)
                    Color c = new Color(samples[i]);
                    int r = c.getRed();
                    int g = c.getGreen();
                    int b = c.getBlue();
                }
                //calculate average of each color ...
                pixelated.getSubimage(x, y, 70, 52).setRGB(0, 0,
                                      70, 52, samples, 0, 70);
}

@override
public String toString() {
    return inetAddress; 
}

        [...]
        avgR = r / samples.length;
        avgG = g / samples.length;
        avgB = b / samples.length;

        //assign average to samples[]
        for(int i = 0; i < samples.length - 1; i++) {
             Color c = new Color(avgR, avgG, avgB);
             samples[i] = c.getRGB();
        }

        //set pixels of the average colors from samples[]
        //to the blank BufferedImage 'pixelated'
        pixelated.getSubimage(x, y, xOffset, yOffset).setRGB(0, 0,
                                      xOffset, yOffset, samples, 0, xOffset);

        int r = 0; int g = 0; int b = 0;
}