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Get one of the calibration laserdiscs by Joe Kane Productions, "A Video Standard" or "Video Essentials".
Navigate to a frame that looks like this:
Find the capture card driver settings, normally a tab in your cap program called "device properties" or similar. Adjust the brightness first; the frame background is black, the thin vertical dark grey strip in the left half of the image is 4% above black (you should just be able to see this if your monitor is set properly). When converted to RGB, the background should be R=G=B=0, and the dark grey strip should be ~10.
The top rectangle in the scale on the right hand side is peak white. Now adjust the contrast until this square's RGB value just reaches 255.
Check the brightness level again and re-adjust if necessary.
Now everything should be set up for optimal capture quality from your LD player; to test, capture one of the grey scale test patterns on that disc - all levels should be distinct and graduated in intensity:
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