The K200D's default sharpness setting is quite strong, causing some artifacts and jagged lines. We'd recommend to stay well clear of any higher settings and probably even tune it slightly down. This will also give you more leeway in post processing.
Sharpness: -4
Sharpness: 0 (Default)
Sharpness: +4
Saturation adjustment
Saturation adjustment gives you control over how vivid the colors in your images are. The default setting is fairly well balanced although reds and greens can appear a little too saturated.
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50% crop
-4
0
+4
Hue adjustment
This setting subtly adjusts the hue of the image, a negative setting makes red tones appear more blue/purple, a positive setting makes them appear more yellowish.