I am beginning my path of learning Photoshop CS. My question is what File presets are you using for 720x486 NTSC Video? Are you working with 720x540, 72 resolution, background (transparent) and Pixel Aspect Ratio (square)? If so how than are you saving the final file, ie., pct? What size, etc?
I use the presets in Photoshop (CS2, but CS has the same) to create 720x480, 0.9 pixel aspect ratio.
That's all that really matters. Sometimes I start with transparent, sometimes white, it depends on what I'm doing. The resolution doesn't matter. (Repeat after me: The resolution doesn't matter. The resolution doesn't matter. -- This is a hard lesson for many people to learn, but ppi/dpi resolution means exactly zero in video.)