Contrast Adaptive Sharpening (CAS)
Adaptive Sharpening with Overshoot Control.
Additionally I would like to remark that the digital optimization work many Pro scanners do is completely evident.
If we see the Howtek crop from the Collaborative Scanner Comparison it is clear that the edges have a deep digital work. If one often takes a microscope to inspect film those edges are from another planet, they are not natural to the lens-film work. Those scanned/enlarged edges are impossible with that low contrast.
If we inspect film with the microscope what we see (at that enlargement) is Epson look.
I theory "internal sharpening" is intended to correct the system pitfalls, not the taken image, as the taken image should be corrected in another level, but in certain conditions it would be difficult for the internal sharpening to guess if blur comes from the taking lens or from the scanning system.
What it's absolutely clear to me (from next crop) is that the howtek did a deep digital optimization work in those (another planet) edges that had to be blurred in the negative, for this reason the (rawer) Epson image can be matched to the Howtek one with Ps:
IMHO the reason why the Epson matches a fancy Howtek is simply because that LF negative has not much more than the Epson can take, and if the Howtek showed those alien edges it is because the edges were blurred on film and the internal digital sharpening did a job, while in the Epson case that job has to be done in Ps.
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