Rendered vs. Unrendered Graphic File Quality

I have a .tif file with a transparency that I layered over a background with other graphic elements. The original file was an .eps that was converted to the .tif format in Photoshop. The current logo on the screen is scaled down to 5% of the original size (high res graphic I assume was created for large format printing).

When the file is exported either to a Quicktime Movie or when eventually burned to DVD (which was already done), the "Y" logo is severely pixelated after render. Here are before and after screenshots.

http://imaginelv.com/FCP_Captures/Unrendered.png
http://imaginelv.com/FCP_Captures/Rendered.png

You can see in the unrendered version the Canvas and Viewer match each other in resolution. When moving into the rendered version, there is pixelation I was referring to earlier.

Now look at this screenshot:

http://imaginelv.com/FCPCaptures/Rendered_WithReference.png

Notice that the Viewer window is set to only 25%. This is with the graphic scaled down to 50%, and the quality is great. Here's what happens when the graphic in the viewer is exported as a still using Quicktime Converstion:

http://imaginelv.com/FCPCaptures/YMCA_Y_OnlyExport.png

Finally, here's a still export of the Canvas window, again using Quicktime Conversion:

http://imaginelv.com/FCPCaptures/YMCA_Mission_VideoStill.png

I'm finding the most common answers are to not to use the Canvas and Viewer for your reference monitor, and set the window size to 100%. I know neither of these are the problem. The same effect shows on an external monitor connected via Firewire. I have been using FCP for years, and have never run into this situation before.

The codec setting on the stills is set to DV/DVCPRO-NTSC. I understand that I will lose some resolution with this codec. When set to Uncompressed, things are fine. Since most of the video I work with, including the motion backgrounds, are using the DV/DVCPRO-NTSC setting, it makes sense to match the sequence settings to the imported video.

Any thoughts on how to solve this little dilemma? Should I keep the Sequence set to Uncompressed 8 or 10 bit? I've been scratching my head for days on this problem.

Dual 2.3 GHz PowerPC G5 2.5 GB DDR SDRAM ATI Radeon 9600 Mac OS X (10.4.9)