Development of lighting and shadows settings are not functions

While implementing a plugin to image processing, I learned something very interesting (for me) on the tones dark and light parameters of development.  The other basic tone settings (exposure, contrast, saturation, etc.) always map any one color to another simple color evenly across the image.  But the dark and light tones can map a given in multiple colors in a single image, depending on the location of the pixel color.

For example, in a test image I made with Shadows = + 100, pixel (824 286) had its origin value of 16-bit color (0, 0, 0) transformed into (1724,1387,852).  Pixel (861 287) was also the original color (0,0,0), but it turns into a color very different (3093,2688,1316).

Abstractly, the other the basic tone settings are functions (any input color is always the same output color), all in shadows and points strong are-to-many mappings (any color input can have several colors of output). I knew that clarity not was not a function - transformed from a pixel value would depend on neighboring pixels.  But it does appear to me that dark and light tones are not functions either.

This property of shadows and highlights well known by experienced users of LR?  (I.e. Rob, I guess you knew that?)

Yup - @Lr4 (PV2012) there are 3 settings using the new algorithm 'magical' from Adobe:

* Clarity

* Puts out

* Shadows

I don't know really enough to fill in many details, except to say that when you use - highlights or + shadows, he 'clarifies' highlights and/or shadows a bit, using the algorithm of the transformed of Laplace-based Adobe developed. Jeff Schewe made us a white paper on this subject in the past, but I do not know the link... For me, it is similar to the "Topaz" detail and Topaz Adjust 'adaptive' improvements - two Photoshop plugins I used regularly until the Lr4 is out (Adobe algorithm is very well done - in my opinion, better than Topaz labs, or others are doing similar things, for example, PhaseOne, DxO, Nikon,..).

FWIW - it's one of the reasons why some people raise hell when Lr4 is out - no way to brighten the shadows using sliders base without getting the effect of clarification... That said, Eric Chan also informed us that extra Lr3 light had a similar mathematical algorithm it backup and therefore Lr4 wasn't new in this regard, only improved...

Rob

Tags: Photoshop Lightroom

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