Strange picture effect,Advise Me Please!

Hello everyone.
This is a 100% Crop from a shot I took yesterday.Perhaps someone can tell me what has caused the strange pixelated effect on some of the veins on the leaf? I have never noticed this before and although it is barely noticeable on a A4 print it still annoys Me. It was taken in Raw(20D) and converted in Photoshop CS with +40 Sharpening. Even with the default +25 sharpening it was still very apparent.
Thanks, Peter.

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You stated that you shot it RAW and converted it.

Converted it to what? TIF, JPEG, etc.? At what size? That may be different from what you show us here.

---Bob Gross---

Converted to Jpeg at standard size 3504/2336. sorry I ommitted this info.

If you're asking about the "zig-zag" effect on some of the slightly angled veins, that's because of mapping a rectangular grid to a diagonal line. You're just peeking in too close and seeing the "grain". It's more obvious at slight angles than at greater ones. But it's just the pixels.