Hope I’m not bringing this from the dead! I’m not a forum user per say…
If I understand you correctly, you need to keep your image sequence at 200 dpi when exporting from after effects. I don’t know the size of your canvas but I will give an example. I make my business cards (3.5×2 inches) in after effects and say I wanted mine exported at 200 dpi as a jpg. This would mean I would have to set my composition up with pixel ratio of 700×400, BUT I’m still not finished as I’m using AE!! Now you have to import this into a photoshop canvas (3.5×2 inches) and scale to fit if some magical way it doesn’t do it by default. Hope this helps if anyone ever sees this lol.
Chris McCorkel
Atlanta CW – Shooter – Editor – Sum GFX