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You should have a look at that page for an overview of pixels' access in OpenCV.

But for a short answer, you could do like this:

float* p;
float* q;
for( int i = 0; i < image.rows; ++i)
{
    p = image.ptr< float >( i );
    q = image2.ptr< float >( i ); // I guess image2 is the same size as image1
    // and both image are in float!
    for ( int j = 0; j < image.cols; ++j)
    {
        // Do whatever you want
        p[ j ] = 255.f * q[ j ] / 3.5f;
    }
}