Graphics Programs Reference
In-Depth Information
2. Switch to the Channels panel and examine the Red, Green,
and Blue channels.
video 47:
Refine Edge Command
for Fine Edges
Look for one with high contrast from the background.
Although all three channels are fairly high contrast, the
Blue channel stands out the most.
3. Duplicate the Blue channel by dragging it onto the New
Channel icon at the bottom of the Channels panel (it looks
like a pad of paper).
4. Rename the new channel Selection by double-clicking
its name.
5. With the Selection channel selected, press Command+L
(Ctrl+L) to invoke a Levels adjustment. Levels is a powerful
command that allows you to adjust the gamma (gray) point as
well as the black and white points.
6. Move the black slider to the right, setting the Input Level to
around 60. The black in the channel should get crisper.
7. Move the white slider to the left, setting the Input Level to
around 190. The gray areas in the channel should switch to
pure white.
8. Move the middle (gray) slider to refine any
gray spots in the channel. A value of 1.5
should be approximately correct.
9. Click OK to apply the Levels adjustment.
10. Command-click (Ctrl-click) on the Selection
channel's thumbnail to load the selection
(you'll see the marching ants).
11. Choose Select > Inverse to reverse the
selected area from the sky to the palm tree.
12. Tu r n on t he v i s ibi l it y for t he RGB cha n nel s
by clicking the RGB composite channel's
visibility icon. Turn off visibility for the
Selection channel.
13. Switch to the Layers panel.
14. Click the Add layer mask button at the bottom of the Layers
panel to turn the palm tree into a layer with a mask added.
video 48:
Color Range Command
and Masking
 
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