计算BGR平均色

COLORREF AvgBGRData(BYTE *bgr,int size)
{
	int r = 0,g = 0,b = 0;
	for(int i=0;i<size;i+=3)
	{
		b += bgr[i];
		g += bgr[i+1];
		r += bgr[i+2];
	}
	r = r/(size/3); r = r>255?255:r; r = r<0?0:r;
	g = g/(size/3); g = g>255?255:g; g = g<0?0:g;
	b = b/(size/3); b = b>255?255:b; b = b<0?0:b;

	printf("%d %d %d\n",r,g,b);
	return RGB(r,g,b);
}