As a rule, red on black usually looks like a$$. In print production, when you lay red text on top of black it 'vibrates' and makes it a little hard to read, especially if you choose a small type size. In video your eyes still see the vibration and you also see the nasty jaggies that often accompany red-colored type. You can try to mitigate it by using a sans-serif typeface in a very LARGE type size. However, the problem I've run into is that the most common compression codecs (H.264, MPEG-2) are not kind to red text, especially the brightest red (R=100, G=0, B=0). I tried eight ways to sunday to get a line of red text on black to reproduce properly for a web video and the only solutions were to A) make it a darker (less rich) red, or B) use another color.
HTH,
JK
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SCQT! Self-contained QuickTime ? pass it on!