Video looks lousy after color correction or cropping

I'm a Sony Vegas user new to FCP. Today I imported some filed from a Sony EX1 XDCAM. I transcoded to proRES422 and all looked fine in the timeline. But, I tried to colorcorrect and once I rendered the image had noticeable deterioration in sharpness and also it introduced some weird purplish noise in the darker areas. I had the same problem when I attempted a simple zoom and crop in motion for a proRES file. What's going on here?
I'm just using a Macbook with an integrated card but I was under the impression FCP is powered by the CPU. I've got 2 gigs of Ram. Speed and smooth playing video isn't a problem.
What could be going on here?

Stab in the dark:
What are your "Playback Video" settings set to under the "RT" pop-up menu in the upper left corner of the Sequence window?
Also, what color appears above the clip in the Sequence?
What does the clip look like if your render it?
XDCAM footage should color correct well, whether it's the native data stream or converted to another codec that's good for editing.
It might not hold up to being scaled, regardless of how it's currently compressed. The picture is farily compressed as soon as it's recorded as XDCAM. Converting to something like ProRes, or Animation at best, or Photo-JPEG at best, only minimizes a compression generation loss when re-compressing later transitions, superimpositions, exporting and so forth.
-Warren

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https://blogs.adobe.com/kevinmonahan/2013/09/11/marking-posts-as-correct-or-helpful-on-the -adobe-forums/

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http://en.wikipedia.org/wiki/Srgb
http://en.wikipedia.org/wiki/Rec._709
http://upload.wikimedia.org/wikipedia/commons/8/8f/CIExy1931_sRGB.svg

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Hello Everyone.
This video Tutorial is By Mr. Jeff Sengstack from Lynda.com
He Is an excellent Instructor. Very good Video Tutorial..
Watch the Online Video Course Premiere Pro: Color Correction and Enhancement

Have to pay to view them, so not much use.

Video looks lousy after color correction or cropping

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