int UVClip(unsigned char *pDst, unsigned char *pSrc, int trigval, unsigned int range)
{
    int i,j;
    unsigned int posx[4][2] = { {0, 0}, {180, 540}, {240, 480}, {240, 480} };
    unsigned int posy[4][2] = { {0, 0}, { 70, 218}, { 70, 218}, {108, 180} };
    unsigned char *ptr, *pDstBuf;
    unsigned char ucInval;
    static int cnt = 0;
    static int timecnt = 0;

    unsigned int rg;

    if (range > 4) 
    {
        rg = 0;
    }
    else
    {
        rg = range;
    }
    
    ptr = (unsigned char*)((int)pSrc + 1);

    pDstBuf = (unsigned char*)((int)pDst + 1);

    for(j = 0; j < 288; j++)
    {
        for ( i = 0; i < 720; i++)
        {
            ucInval = *ptr;
            if(ucInval < trigval)
            {
                *pDstBuf = 0x10;//0x10
            }
            else
            {
                *pDstBuf = *ptr;
                if ( (i > posx[rg][0])&&(i < posx[rg][1])&&(j > posy[rg][0])&&(j < posy[rg][1]))
                {
                    cnt++;
                }
            }
            ptr += 2;
            pDstBuf += 2;
        }
    }

    _DrawRect(pDst, posx[rg][0], posy[rg][0], posx[rg][1], posy[rg][1]);

    if(25==timecnt++)
    {
        timecnt = 0;
        stSysStat.uvcps = cnt/25;
        gUiUpdate = 1;
        cnt = 0;
        if (stSysStat.uvrange > 0)
        {
            SendCnt2Sys(stSysStat.uvcps);
        }
    }
    return (stSysStat.uvcps);
}

然后显示屏可以显示背景为黑色，中间有很多白色像素点，（我这里的摄像头是采集的紫外光子，同时对光子计数），问题是，我想改变这个白色的像素点为蓝色或者黄色或者红色等等，应该如何操作？感谢大神帮忙花点时间看看，先谢谢了