Yes, the Bayer array sensor design de-sharpens the image somewhat. You need to put it back and sometimes add a little extra during processing, whether at home or in the camera. Most cameras come preset with some level of sharpening set in the camera for JPeg snapshots. Often you see a review where the reviewer said that default sharpening was a little soft. That's adjustable, so not something to pay attention to.
I'm not going to get into how sharpening works, but sharpening is best done as the last thing after you size the image. The amount of sharpening needed is determined by the size and usage of the image. If you're just playing around or shooting JPeg, it doesn't really matter much, but when you get really serious about processing, it will matter.
I shoot RAW and do everything but sharpening then save it as a TIFF. Later, when I want a print, web or email type Jpeg, I load the TIFF up, downsize it, then do the sharpening for that size and use. Just my opinion.
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Cheers, Craig
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