__inline void ConvertRGB2HSV(
unsigned char sR,unsigned char sG,unsigned char sB,int *dH,int *dS,int *dV)
{
      float fTemp,fDelta;
      int nMin,nMax;
      nMin = min( sR, min( sG, sB ));
      nMax = max( sR, max( sG, sB ));
      fDelta = nMax - nMin;
      *dV = nMax;
      if(nMax == nMin)
             *dH = *dS = 0;
      else
      {
             fTemp = fDelta / nMax;
             *dS= (int) (fTemp * 255);
             if(sR == nMax)
                   fTemp = (float)(sG - sB) / fDelta;
             else if(sG == nMax)
                   fTemp = 2.0 + ((float)(sB - sR) / fDelta);
             else
                   fTemp = 4.0 + ((float)(sR - sG) / fDelta);
             fTemp *= 60;
             if(fTemp < 0)
                   fTemp += 360;
             if(fTemp == 360)
                   fTemp = 0;
             *dH = (int)fTemp;
      }
}

unsinged char sR,sG,sB;
int dH,dS,dV;
int nMaxH,nMinH,nMaxS,nMinS,nMaxV,nMinV;
nMaxH = nMaxS = nMaxV = 0;
nMinH = nMinS = nMinV = 360;
RGBTRIPLE *pPixel = (RGBTRIPLE *)pSourceBuffer;
//for(int j = 0; j < 576; j++)
//for(int i = 0; i < 768; i++)
int i=0;
while(i++ < 768 * 576)
{
      sR = pPixel->rgbtRed;
      sG = pPixel->rgbtGreen;
      sB = pPixel->rgbtBlue;
      ConvertRGB2HSV( sR, sG, sB, &dH, &dS, &dV);
      if( dH > nMaxH)
            nMaxH = dH;
      if( dH < nMinH)
            nMinH = dH;
      if( dS > nMaxS)
            nMaxS = dS;
      if( dS < nMinS)
            nMinS = dS;
      if( dV > nMaxV)
            nMaxV = dV;
      if( dV < nMinV)
            nMinV = dV;
      pPixel++;
}