PanoTools NG:
Re: OT: Local Contrast
Erik Krause 2006-Nov-13 23:18:09
On Monday, November 13, 2006 at 7:46, Carel wrote:
> Is there a way in Photoshop to
> automatically mask areas above and below a given exposure threshold?
Yes, of course. Create a selection from the RGB channel by Ctrl-Click
into the RGB channel display in channels palette. Save to a or an
alpha channel. Then use a curve on that layer shaped as a hill top (a
reversed U) This curve should paint the very light and very dark
areas black and the midtones should stay white. Load this as
selection and use your USM filter.
A better way might be to duplicate the layer and use USM on the
bottom one. Then mask the above layer with the technique described
above but an U-shaped curve. This way you have WYSIWYG control on the
effect.
If you save the curve to a file and record the rest to an action you
have an automatism.
Using a curve is far better than using a threshold since there will
be no hard edge and hence no banding.
best regards
--
Erik Krause
Resources, not only for panorama creation:
http://www.erik-krause.de/
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