[old_tv_nut]

OK - the picture may be overall better with the DVD, but basically the color should be correct with either one. If the cable box and the DVD are on two different channels, make sure the fine tuning is adjusted properly for both, as it can affect the color, especially on older sets.

Quick picture adjust sequence:
1) Fine tuning (usually, turn clockwise until there is sound interference in the picture, then back off counterclockwise until it just disappears)
2) Brightness(or Black Level) - adjust for good blacks (dark objects should be just bright enough to show detail, but not look foggy)
3) Contrast (or Picture) -adjust for reasonably bright picture, but don't overdo it because it can cause bright highlights to "bloom" out of focus
4) assuming you have some color, adjust tint (or hue) for proper flesh tones - not green or purple
5) adjust color (level) for best flesh tones - not too pale or vivid
6) touch up (4) and (5) slightly if needed

7) Adjust focus if needed - normally shouldn't need frequent adjustment

Edit: on older sets with less than 100% DC coupling, (2) and (3) will interact a bit also