Originally posted by Na Horuk Hm, I seem to remember someone saying, for some other Pentax camera, that one of those affects the photo globally, and the other affects the edges more than centre? But Im not sure. Maybe it would be easier to understand if we looked at those labels in a different language.
Hi Na Horuk,
I believe that person misconstrued the statement about the difference. IIRC, Pentax, when they added the "Fine Sharpness" option, stated something to the effect that "Sharpness" effects the image more globally, and "Fine Sharpening" concentrates more on edges (as opposed to points) within the image. This would supposedly result in added apparent crispness without as much accentuation of the noise. Personally , I've never seen much difference.
The two modes, Sharpness or Fine Sharpness, is a choice of processing paths. You're supposed to choose one or the other, then set up the camera to process by the algorithms used by either, but not both, according to preference. That's why the setting values don't change when you switch from one to the other. The one you choose sets the in-camera sharpening parameters for jpeg processing, the other is inactive.
I also believe the scales used to indicate the level of these settings are a bit misleading. With either mode, the zero setting is actually the default value finalized by what the camera's engineers saw as the best compromise between apparent crispness and noise. By going to the negative, you're just choosing to have the camera add less sharpening, even down to the lowest value of -4. IMO, there is still some edge contrast added in their jpeg engine even when set to the lowest value, but it's pretty minimal. The camera's jpeg engine uses some variation of unsharp mask to sharpen as it's effective, very fast, and needs the least processing power to accomplish the goal.
I shoot jpegs the great majority of the time, and prefer deconvolution sharpening over what's used in-camera, so I set up all of my cameras' Custom Image settings for Sharpening to -4 so the image delivered is processed minimally for this parameter. I then apply some NR in post before sharpening. I use Topaz Denoise for the NR and Topaz InFocus for sharpening.
Especially in high ISO situations, I'll usually also drop the contrast setting because this setting also effects the noise as well as shrinking the DR, which in low light and higher ISO is already limited. I then bump the contrast in post to my liking.
Scott