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Yes it makes difference and should use pointer in loops

int i,j;
uchar* p;
for( i = 0; i < nRows; ++i)
{
    p = I.ptr<uchar>(i);
    for ( j = 0; j < nCols; ++j,p++)
    {
        *p = table[*p];
    }
}

If you want to improve code you can use ParallelLoopBody. Reading your code I think all is already written in LUT functions

Yes it makes difference and you should use pointer in loops

int i,j;
uchar* p;
for( i = 0; i < nRows; ++i)
{
    p = I.ptr<uchar>(i);
    for ( j = 0; j < nCols; ++j,p++)
    {
        *p = table[*p];
    }
}

If you want to improve code you can use ParallelLoopBody. Reading your code I think all is already written in LUT functionsfunction