Java HSB color model: colors changing with brightness?

Question

Why does altering brightness changes color in HSB color model? Here's my code:

for (int y=0; y<height; y++)
    for (int x=0; x<width; x++) {
        Color pix = image.getPixel(x, y);
            float[] hsb = new float[3];
            Color.RGBtoHSB(pix.getRGB(),pix.getGreen(),pix.getBlue(),hsb);
            Color newColor = new Color(Color.HSBtoRGB(hsb[0], hsb[1],(float)0.5));
                image.setPixel(x, y, newColor);
        }

The code assigns value of 0.5 to brightness of each pixel in image.

Answer 1

You made a mistake in your call to Color.RGBtoHSB.

You wrote:

Color.RGBtoHSB(pix.getRGB(),pix.getGreen(),pix.getBlue(),hsb);

You probably wanted:

Color.RGBtoHSB(pix.getRed(),pix.getGreen(),pix.getBlue(),hsb);