【转】YUV值对应的颜色

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最近有人在网上问我，YUV的值对应的颜色是如何的

下面给出YUV值对应的颜色关系

256张图512x512，每张对应的Y为0~255   每4x4对应的是同一颜色区域  横坐标 U  纵坐标V

yuv下载地址

http://download.csdn.net/detail/cabbage2008/9314683

这里截取了Y=0,10,20,60,128,250,255几张

Y=0

Y=10

Y=20

Y=60

Y=128

Y=250

Y=255

生成代码：

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

typedef       void                Void;
typedef       bool                Bool;
typedef       int                 Int;
typedef       unsigned char       UChar;
typedef       UChar               Pel;        ///< 16-bit pixel type

class TComPicYuv
{
private:

    // ------------------------------------------------------------------------------------------------
    //  YUV buffer
    // ------------------------------------------------------------------------------------------------

    Pel*  m_apiPicBufY;           ///< Buffer (including margin)
    Pel*  m_apiPicBufU;
    Pel*  m_apiPicBufV;


    // ------------------------------------------------------------------------------------------------
    //  Parameter for general YUV buffer usage
    // ------------------------------------------------------------------------------------------------

    Int   m_iPicWidth;            ///< Width of picture
    Int   m_iPicHeight;           ///< Height of picture

public:
    TComPicYuv         ();
    virtual ~TComPicYuv();

    // ------------------------------------------------------------------------------------------------
    //  Memory management
    // ------------------------------------------------------------------------------------------------

    Bool  create      ( Int iPicWidth, Int iPicHeight );
    Void  destroy     ();

    Void  setYuv      (Pel pixelY,Pel pixelU,Pel pixelV);
    Void  setPixel    (int posX, int posY, int width, Pel pixelY,Pel pixelU,Pel pixelV);

    // ------------------------------------------------------------------------------------------------
    //  Get information of picture
    // ------------------------------------------------------------------------------------------------
    Pel*  getPicBufY  ()     { return m_apiPicBufY ; }
    Pel*  getPicBufU  ()     { return m_apiPicBufU ; }
    Pel*  getPicBufV  ()     { return m_apiPicBufV ; }

    Int   getWidth    ()     { return  m_iPicWidth;    }
    Int   getHeight   ()     { return  m_iPicHeight;   }

    Int   getStride   ()     { return  m_iPicWidth ;    }
    Int   getCStride  ()     { return  (m_iPicWidth >> 1); }

};// END CLASS DEFINITION TComPicYuv

TComPicYuv::TComPicYuv()
{
    m_apiPicBufY      = NULL;   // Buffer (including margin)
    m_apiPicBufU      = NULL;
    m_apiPicBufV      = NULL;
}

TComPicYuv::~TComPicYuv()
{
}

Bool TComPicYuv::create( Int iPicWidth, Int iPicHeight )
{
    m_iPicWidth       = iPicWidth;
    m_iPicHeight      = iPicHeight;


    m_apiPicBufY      = (Pel*)malloc(m_iPicWidth * m_iPicHeight * sizeof(Pel));
    m_apiPicBufU      = (Pel*)malloc((m_iPicWidth >>1) * (m_iPicHeight>>1) * sizeof(Pel));
    m_apiPicBufV      = (Pel*)malloc((m_iPicWidth >>1) * (m_iPicHeight>>1) * sizeof(Pel));

    return true;
}

Void TComPicYuv::destroy()
{

    if( m_apiPicBufY ){ free( m_apiPicBufY );    m_apiPicBufY = NULL; }
    if( m_apiPicBufU ){ free( m_apiPicBufU );    m_apiPicBufU = NULL; }
    if( m_apiPicBufV ){ free( m_apiPicBufV );    m_apiPicBufV = NULL; }

}

Void TComPicYuv::setYuv(Pel pixelY,Pel pixelU,Pel pixelV)
{
    if( m_apiPicBufY ){ memset(m_apiPicBufY, pixelY,m_iPicWidth * m_iPicHeight * sizeof(Pel)) ; }
    if( m_apiPicBufU ){ memset(m_apiPicBufU, pixelU,(m_iPicWidth >>1) * (m_iPicHeight>>1) * sizeof(Pel)) ; }
    if( m_apiPicBufV ){ memset(m_apiPicBufV, pixelV,(m_iPicWidth >>1) * (m_iPicHeight>>1) * sizeof(Pel)) ; }
}

Void TComPicYuv::setPixel(int posX, int posY, int width, Pel pixelY,Pel pixelU,Pel pixelV)
{
    Pel *Y = m_apiPicBufY + posY*m_iPicWidth+posX;
    for(int h = 0; h<width; h++)
    {
        for(int w = 0; w<width;w++)
        {
            Y[h*m_iPicWidth + w] = pixelY;
        }
    }

    Pel *U = m_apiPicBufU + (posY>>1)*(m_iPicWidth>>1)+(posX>>1);
    Pel *V = m_apiPicBufV + (posY>>1)*(m_iPicWidth>>1)+(posX>>1);

    for(int h = 0; h<(width>>1); h++)
    {
        for(int w = 0; w<(width>>1);w++)
        {
            U[h*(m_iPicWidth>>1) + w] = pixelU;
            V[h*(m_iPicWidth>>1) + w] = pixelV;
        }
    }
}

int main()
{
    TComPicYuv *frame = new TComPicYuv;
    TComPicYuv *clourMap = new TComPicYuv;

    frame->create(8,8);
    clourMap->create(512,512);

    FILE *FrameFile = fopen("D:\clourFrame_8x8.yuv","wb");
    FILE *clourFile = fopen("D:\clourMap_512x512.yuv","wb");

    for(int Y = 0; Y<256; Y++)
    {
        for(int U = 0; U<256; U++)
        {
            for(int V = 0; V<256; V++)
            {
                frame->setYuv((Pel)Y,(Pel)U,(Pel)V);
                fwrite(frame->getPicBufY(),1,frame->getWidth()*frame->getHeight(),FrameFile);
                fwrite(frame->getPicBufU(),1,(frame->getWidth()*frame->getHeight())>>2,FrameFile);
                fwrite(frame->getPicBufV(),1,(frame->getWidth()*frame->getHeight())>>2,FrameFile);

                int  count = Y*256*256 + U*256 + V;
                if(count%1000000==0)
                {
                    printf("=");
                }
            }
        }
    }

    for(int Y = 0; Y<256; Y++)
    {
        for(int U = 0; U<256; U++)
        {
            for(int V = 0; V<256; V++)
            {
                clourMap->setPixel(U*2,V*2,2,Y,U,V);
            }
        }

        fwrite(clourMap->getPicBufY(),1,clourMap->getWidth()*clourMap->getHeight(),clourFile);
        fwrite(clourMap->getPicBufU(),1,(clourMap->getWidth()*clourMap->getHeight())>>2,clourFile);
        fwrite(clourMap->getPicBufV(),1,(clourMap->getWidth()*clourMap->getHeight())>>2,clourFile);

        printf("*");
    }

    fclose(clourFile);
    fclose(FrameFile);

    frame->destroy();
    clourMap->destroy();
}