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I am using Photoshop CS2 on a Windows XP SP2 platform. I am working in RGB using the Adobe RGB (1998) color space.
I’ve been reading the book, "Real World Image Sharpening with Adobe Photoshop CS2" by Bruce Fraser. (The book is excellent by the way!)
One of the things the book discusses is creating a selection mask (by using Image > Calculations) and using it as a layer mask to constrain sharpening or reduce noise filters applied to that layer.
After he creates a mask (saved as an alpha channel) he clearly shows applying a Levels adjustment and a Curves adjustment to an alpha channel. For example, on page 180, he shows a screen shot (Figure 5-17) where a Curves dialog shows "Alpha 1" in the Channel drop down. And, on page 186, he shows a screen shot (Figure 5-25) where a Levels dialog shows "Alpha 2" in the Channel drop down.
Does anyone know how to do this? I can’t seem to get the alpha channels to appear in the drop down menus for either Levels or Curves.
Thank you in advance for your advice, tips, comments, and suggestions!
-Anne
I’ve been reading the book, "Real World Image Sharpening with Adobe Photoshop CS2" by Bruce Fraser. (The book is excellent by the way!)
One of the things the book discusses is creating a selection mask (by using Image > Calculations) and using it as a layer mask to constrain sharpening or reduce noise filters applied to that layer.
After he creates a mask (saved as an alpha channel) he clearly shows applying a Levels adjustment and a Curves adjustment to an alpha channel. For example, on page 180, he shows a screen shot (Figure 5-17) where a Curves dialog shows "Alpha 1" in the Channel drop down. And, on page 186, he shows a screen shot (Figure 5-25) where a Levels dialog shows "Alpha 2" in the Channel drop down.
Does anyone know how to do this? I can’t seem to get the alpha channels to appear in the drop down menus for either Levels or Curves.
Thank you in advance for your advice, tips, comments, and suggestions!
-Anne
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