Ive captured video via a tv card from an analog camera. It looks fine while being captured, and the clips look fine when viewed on windows media player.

I made a short movie 30 seconds long just to see if i had settings correct etc. 3 clips and 2 transitions. When i render or export the completed movie, the resuling picture appears to be of a poorer quality. It appears as if the picture is made up of less colours, so you get blocks of colour of different shades, instead of a gradual shading. You get this effect on some 1970's pop videos.. Im sure there is a name for it...

Anyon know what ive done wrong???