The mysterious Sigma Photo Pro.

After a few months I return to publish something on the always interesting and powerful Foveon sensor inside the Sigma cameras.
Despite the operational slowness and the typical limits of technology that the various Merrill or Quattro have, the big problem for those who try to use the RAW capabilities of these cameras comes from the program used to process the images, the “so different” Sigma Photo Pro software.

With this article my purpose is not not to create a comprehensive tutorial to describe in a complete way all the variables that affect the values of the images, it would be an endless discussion having each parameter affects the other ; my will is to illustrate the results I have achieved after hundreds of tests and comparisons even with the kind help of industrial graphics professionals to finally have a tiff image of fine art ready to be opened on photoshop without flaws and with the magnificent quality I expect from these cameras.

As you can see above, the panel on SPP with my “standard” settings have:

+NEGATIVE sharpening (-1,5/-0.8)

+ZERO nr settings (-2,-2,-2)

+NEUTRAL colours

Why the negative sharpening?
The tiff I’m looking for should be clean, crisp, ready to be processed on PS like a Canon raw just after the “RAW presharpener” action of the famous  Nik Suite.
The SPP software applies an excessive action of sharpening to images that become too hard and difficult to deal with the default parameter; with a reduction the result is cleaner and ready to the other two stages of sharpening (selective and export).

The ZERO NR settings is the IMHO best way to follow the purpose as I described above; colour on ZERO to avoid “over details” effects, noise to ZERO to have maximum amount of details and to control the noise on PS, and the same on third setting.

Here some samples:

first image with 100% crop, second with 300% crop