6442-YCbCr转换为565-RGB |

如下代码实现YCbCr(6:4:4:2)到RGB(5:6:6)的转换：
for(i = 0 ; i < 0x10000; i++)
{   
    count++;

    //得到y，cb，cr颜色分量
    y = (i&0xFC00)>>10;
    u = (i&0x03C0)>>6;
    v = (i&0x003C)>>2;

    //每个分量为8bits
    Y = (double) (y<<2);
    Cb = (double) (u<<4);
    Cr = (double) (v<<4);

    //计算r，g，b颜色分量，每个分量为8bits
    r = (int) (Y + 1.40200 * (Cr - 0x80));
    g = (int) (Y - 0.34414 * (Cb - 0x80) - 0.71414 * (Cr - 0x80));
    b = (int) (Y + 1.77200 * (Cb - 0x80));

    r = max(0, min(255, r));
    g = max(0, min(255, g));
    b = max(0, min(255, b));

    //r = (unsigned char)(1.164383*(y- 16) + 0 + 1.596027*(v - 128)); 
    //g = (unsigned char)(1.164383*(y- 16) - 0.391762*(u - 128) - 0.812969*(v - 128)); 
    //b = (unsigned char)(1.164383*(y- 16) + 2.017230*(u - 128) + 0 );

    //printf("\033[32m y : [0x%04x] %x u : %x v : %x \t RGB:[0x%02x%02x%02x] \n\033[0m", i, y, u ,v ,r, g, b);
    //printf("%x %x %x\n", (((unsigned int) r)&0x00F8)<<8, (((unsigned int) g)&0x00FC)<<3, (((unsigned int) b)&0x00F8)>>3);

    //计算5:6:5 RGB
    rgb = ((((unsigned int) r)&0x00F8)<<8) + ((((unsigned int) g)&0x00FC)<<3) + ((((unsigned int) b)&0x00F8)>>3);

    //printf("565RGB : %x", rgb);

    printf("0x%04x, ", rgb);
    if(count%8 == 0)
        printf("\n");
}