Split screen causes artifacting in images - what is the solution?

After creating a four image split screen (two frames on top, two frames on the bottom), the images in each box suffer from extreme artifacting. By that I mean the images breaks down. For example, grass that in the original images is clearly and cleanly visible, suddenly becomes very "noisy" once I have added it to the split screen.
I have gone through several attempted solutions, but have all failed to solve the problem.
The degradation is most noticable when I export to a Mpeg2 and burn to a DVD, but I have eliminated the possibility that it is breaking down in the Mpeg2 conversion. Instead, it seems to be happening within Final Cut Pro.
Can anyone offer suggestions that might help?

Patrick. Thanks very much for jumping in.
For clarification, the images in the split screens are not photos. They are films. Four films in four boxes playing on the screen at the same time. Therefore, correct me if I'm wrong, your Photoshop advice doesn't work here. Also, I do not have Motion.
I took a look at the suggestion in your final paragraph. I have Final Cut Pro HD 4.5, but nevertheless went through your suggested workflow. Ctrl-clicked on the sequence - selected settings - clicked on the Video Processing tab. I don't have a sampling setting as you indicate per se, but I did try changing the only apparently appropriate setting in FCP 4.5, which was to change from Render in 8-bit YUV to Render all YUV material in High Precision YUV. This took twice as long to render the sequence, but unfortunately had no positive effect.
So, I am still in the position of having 4 great looking videos sequences, that I am trying to combine into one 4-squared split screen, but when I do so each of the four sequences deteriorates substantially.
Do you have any other suggestions? I would be grateful for your experience.
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Split screen causes artifacting in images - what is the solution?

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