H.264 export video artifacts with regular background pattern

I'm generally very pleased with the flexibility and quality of the H.264 video encoder provided by Premiere Pro.
However, I have one scene, with a graph-paper-like background that generates video artifacts when zooming in and out, no matter how high I set the bitrate.
I'm including two images created by grabbing frames from the exported movie from Quick Time Player.  The first shows the scene without artifacts (at the end when the
zooming is over) while the second shows the effect when I'm zooming in on the scene.  As you can see, the artifacts consist of graying out of the black lines and appearance of some "tick" lines along the lines, which I assume is due to the compression algorithm used by the codec.   Does anyone have experience with such problems and can suggest a way to avoid this? It's a relatively short segment of the video that is effected.
Thanks in advance!
--Charles Gunn

Hmmm... the second file ppVideoArtifactOn.jpg appears by name in the original posting after the first, visible image.  I'm not sure why it's not showing up, but I'll include it here again:

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