I've prepared TIFF file with all my final rolling credits and logos in Photoshop, I've got TIFF with LZW compression as it is usually recommended and with dimentions 1920x1080 as soon as I have HD project.
But after rendering and exporting titles from Final Cut they looked awfull - pixels, blurry and having these interlace lines.
What helped me (maybe it will not work for you). I've entered my Sequence Settings (in Final Cut - Sequence => Settings or cmd+0).
In General I've changed Quality to Best.
In Render optiongs I've changed Field Dominance: None (I had Upper by default)
The way it looked in my case you can see on the image below.
