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Hi [USER=109010]@Rich54[/USER]


Here is a walkthrough of what is going on with that curves adjustment Layer.


Here is the starting image I used:


[ATTACH=full]149427[/ATTACH]


I applied a curve adjustment layer with linear edges, all going in the same direction (just zigs).  I did this with the pencil tool in the Curves Adjustment Layer.


[ATTACH=full]149428[/ATTACH]


The following is the same image with overlay annotations:

[ATTACH=full]149429[/ATTACH]


I annotated seven zones of input values (x-axis) in alternating blue and cyan in the above image.

This Curves adjustment Layer takes the RGB values in its particular zone and amplifies those colors in that zone maximizes contrast in the zone.

The image pixels in each of their particular zone are contrast amplified in the same fashion for all several zones.


The next image shows when I take the curves in just the cyan zones and invert them:


[ATTACH=full]149430[/ATTACH]


Following is the annotate version:


[ATTACH=full]149431[/ATTACH]


So, the pixels were inverted or made into a color negative for those alternating cyan zones.


So what is going on is the pixels that originated in the blue zones are maxed out in contrast to that zone.

The pixels originating from the aqua zones are also maxed on in contrast and in addition color inverted.


The only difference between the above and the solar curve is that the zone transitions are smooth.


I hope that helps you understand what is going on. 


John Wheeler


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