C++ 调节图像饱和度

 

 

BYTE bySaturationMap[256*256];
//滚动条0-255
//......
CreateSaturationMap(m_saturationctl.GetPos());
//......
void CreateSaturationMap(BYTE value)
{
int nTmp;
for (int g=0; g<256; ++g)
{
for (int i=0; i<256; ++i)
{
nTmp = g+ value*(i-g)/128;
nTmp = min(255, max(0, nTmp));
bySaturationMap[g*256+i] = nTmp;
}
}
}
void Img_ISP(BYTE* pData, int wid, int hei)
{
int g, r, b;
BYTE *pNode = NULL;
pNode = pData;
for (int j=0; j<hei; j++)
{
for (int i=0; i<wid; i++)
{
r = *pNode;
g = *(pNode+1);
b = *(pNode+2);
*pNode
= bySaturationMap[g*256+r];
*(pNode+2) = bySaturationMap[g*256+b];
pNode = pNode+3;
}
}
}