Photoshop comes with a free Adobe Gamma ICM profile creator in windows-control panel. I can’t guarantee perfection because low end LCD’s aren’t as accurate as professional ones. But you’ll definately be better off.
You’ll use SD-TV color color management for project settings and view simulate output.
The broadcast spec out 16-235 levels so that the NTSC won’t get line crawl use a gradual change so its a legal signal, but Color finesse does a better job.
For starters…
use photoshops’ Adobe gamma in control panel, adjust each red, green, blue, and save the icm file at gamma 1.8(mac) or 2.2(win) gamma, then setup AE with color management.
you need to give your project’s Working Space a color profile in order to use a color managed workflow (this includes simulated outputs). You can do this in Project Settings (cmd-opt-shift-k on Mac, ctrl-alt-shift-k on PC).
Each file has an interpret color management plus AE has blend color, legacy colors, etc. all these plus you need the exact same codec versions, gamma calibrated monitor…
plus how you are viewing them back out. Quicktime player preferences could be different too. Use your scopes rather. Do a full render-loop, export/import file, with no color changes, there should be no change in gamma. That way tests for a correct color management setup.
Now unless, you have software like powerstrip that changes your LCD to interlaced 59.94 hz, you won’t be able to check for line flicker. But a 10 cent dvd-r can do that, can’t it? A long time ago I used to change my monitor to interlaced and send out composite to TV before I had decklink/aja, but there’s noten like a shoestring budget, is there?