This is a tricky question to answer. We will have to address the rows and columns separately.
It may be possible to acquire more rows in your image, but I don't know if you can acquire all 494 rows that the camera acquires. Typically, cameras don't send all the pixels that they can possibly acquire. To try to get more rows, you can increase the setting in MAX.
Columns is a different story. In an analog camera, the values from each pixel are combined to create an analog waveform that is sent out as the video signal. They are not distinct pixels any more. On the computer end, you can chop the waveform into as many pixels as you want, but the pixel ratio changes. The height and width of each pixel is no longer square. There really isn't much advantage
in changing the number of pixels. You might be able to get a few more pixels by changing the parameters in MAX, but you won't be able to get it up to 768.
Bruce
Bruce Ammons
Ammons Engineering