I am using the Sony Pixelate effect to blur a face. In preview it looks great however when I render the clip the pixelation is much smaller and does not blur the face enough. I have tried changing the pixel size but the rendered output does not change.
Please help,
Sid.
Make sure you set your Preview window to Best/Full when you're trying to figure out the correct setting otherwise, as you've discovered, you won't see what you're going to get.
Yes, there are several effects that unfortunately scale to the displayed pixel size rather than the project/output frame size. Light rays is another one. You can get huge bright rays in a 427x240 preview window, but render the same settings to 1920x1080 and the rays will be so short you can barely even tell they're there.