Getting captions to look good on DVD

[Per Scaffidi]

I created a DVD for a client and for the first time used captions tracks (previously had hard-coded the captions into the video). I’m using Arial font bold 18 pts, but the captions don’t look great, lots of stair-stepping. Is this a limitation of it being SD resolution & 2bit color, or am I missing some settings to get these to look better?