I've been using the L channel method with unsharp mask from my very earliest
days with PS. Also using Unsharp mask on my masters and then reapplying when
I get to the final output - using differing paramenters for each.
Kenneth Waller
http://www.pentaxphotogallery.com/kennethwaller
----- Original Message -----
From: "Bruce Walker" <bruce.wal...@gmail.com>
Subject: Re: Sharpening with a high pass filter
Sharpening the L channel in LAB space is a great method that prevents
any colour shifts. (This is effectively what the sharpening controls in
ACR and LR do now apparently.)
I've always found that filtering that you apply to the A or B channels
has only really subtle effects. I don't think you'd see the effects of
sharpening them very much unless you pixel peep. You can, for example,
apply very large amounts of Gaussian blur to A and B and barely notice
it when you revert to RGB.
Contrast or Curves tweaks on A & B on the other hand are marvelous. You
can get really nice colour saturation boosts without clipping or
blooming. I've used that on flowers and it works really well.
-bmw
On 11-04-20 12:36 PM, AlunFoto wrote:
I've never tried that, but I think it looks interesting.
It reminds me of another alternative sharpening technique, to convert
the image to LAB colour space, and do sharpening on the A or B
channel. Conversely, blurring in the same channels is a trick to
remove moiré.
Jostein
2011/4/20 Steven Desjardins<drd1...@gmail.com>:
I was directed to this site yesterday:
"With great megapixels comes great responsibility."
I couldn't quite get the process to work. I think when I initially
select all I only have one layer so I can't do exactly what they say.
also, I just end up with the high pass results and no overall picture.
Does anyone use this approach?
--
Steve Desjardins
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