Merrill SPP 5.5.3 Neutral Sharpening Re-visited

Started Jan 22, 2018 | Discussions thread
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xpatUSA Forum Pro • Posts: 13,886
Merrill SPP 5.5.3 Neutral Sharpening Re-visited

I regard the SPP sharpening slider as a tool for 'capture sharpening'. As mentioned here , raw captures are a bit soft, even Merrills. So some sharpening by the converter is desirable. Recently, I managed a pretty sharp shot with the DP2M and today, being up far too early, I thought to seek a more precise definition of 'neutral' as far as sharpness is concerned. Previously, I had used the shape of the edge response, judging for a lack of overshooting (halos). With that method, I had concluded that -1.0 was a reason setting.

However the DP2M image, sharpened thus, showed an oddity in it's QuickMTF plot: the LPH for MTF50 was more than height of the image, i.e. more than 3136. That indicates over-sharpening from my setting of -1.0. So I embarked on tests to find the setting that gave as close to 3136 LPH as possible. That setting was -1.3.

Here's the plots for the raw top layer and for the setting of -1.3 . .

Raw top layer at left

Realizing that graphs are not real popular here, I offer the actual SPP image for those who prefer a visual assessment:

Sorry, no shrubbery or rolling hills in my living room.

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