RGB value -- RGB -- YCrCb -- RGB -- RGB value conversion help?

Hi,
I am using bufferedImages and the method getRGB() and setRGB().
I was wondering how I can convert a negative RGB value like -6262262 to RGB values like 155, 80, 90. Then convert those to Y' Cb Cr values like 0.23, 0.212, 013. And then I have to convert them back to RGB values (e.g. 155, 80, 90) and then to the negative RGB value (e.g. -6262262). I need methods like the following:
// Return RGB red value:
public static int RGB_redValue (int rgb)
    // code
// Return RGB green value:
public static int RGB_greenValue (int rgb)
    // code
// Return RGB blue value:
public static int RGB_blueValue (int rgb)
    // code
// Return Y'CbCr, Y value:
public static double YCbCR_YValue (int red, int green, int blue)
    // code
// Return Y'CbCr, Cb value:
public static double YCbCR_CbValue (int red, int green, int blue)
    // code
// Return Y'CbCr, Cr value:
public static double YCbCR_CrValue (int red, int green, int blue)
    // code
// Return RGB red value:
public static int RGB_redValueFromYCbCr (double Y, double Cb, double Cr)
    // code
// Return RGB green value:
public static int RGB_greenValueFromYCbCr (double Y, double Cb, double Cr)
    // code
// Return RGB blue value:
public static int RGB_blueValueFromYCbCr (double Y, double Cb, double Cr)
    // code
// Return RGB value:
public static int RGB_value (int red, int green, int blue)
    // code
}All I need is the YCrCb value from a bufferedImages and then I need to set the specific pixels to the Y values. I couldn't find any methods that I can use to do so. If anybody has methods like above, please post. If not, then can you write the formulas or link them. Thanks.

    // Return RGB values:
    public static int RGB_red (int rgb)
        int myR = (rgb >> 16) & 0xff;
        return myR;
    public static int RGB_green (int rgb)
        int myG = (rgb >> 8) & 0xff;
        return myG;
    public static int RGB_blue (int rgb)
        int myB = rgb & 0xff;
        return myB;
    }And YCrCb to RGB and RGB to YCrCb is quite easy:
RGB to YUV Conversion
Y = (0.257 * R) + (0.504 * G) + (0.098 * B) + 16
Cr = V = (0.439 * R) - (0.368 * G) - (0.071 * B) + 128
Cb = U = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128
YUV to RGB Conversion
B = 1.164(Y - 16) + 2.018(U - 128)
G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
R = 1.164(Y - 16) + 1.596(V - 128)

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