[Tig] acutance and sharpness

[Jim Houston]

Unfortunately, his definition of acutance is wrong (although the  
examples are right).
Acutance is not the rate of change of an edge.    If the slope
of an edge is lower, that is a property of sharpness.
Acutance is when the contrast of the edge is increased causing
the human visual system to believe that the edge has a sharp
transition (even if it doesn't).

Jim H.


On May 22, 2007, at 3:07 AM, Rob Lingelbach wrote:

> Thanks to The Chimney Pot for support in 2007.
> Guide to TIG Posting is at
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>  ====
> Kim Sargenius sent me this reference regarding acutance and  
> sharpness, it seems to be an excellent tutorial.
>
> http://www.cambridgeincolour.com/tutorials/sharpness.htm
>
> Rob
> --
> Rob Lingelbach
> http://www.colorist.org/robhome.html
> rob at colorist.org      rob at calarts.edu
>
>
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