User Guide

Using Alpha Channels220
Creating Channels
You can create a channel from a
selection or create a new, blank
channel.
You can also create a new channel by
copying an existing channel. For more
information, refer to “To copy a
channel:” on page 224.
To save a selection to a channel:
• Choose Select menu > Save
Selection.
For additional information, refer to
“Saving Selections” on page 210.
To create a new, blank channel:
• On the Channels palette, do one of
the following :
• Click the palette menu arrow
and choose New.
• Click the New Channel button
.
Generating Channels
Automatically
Corel Painter lets you generate a
channel based on the light and dark
areas of a number of sources,
including paper, pattern, and clone
source.
You can also create a channel based on
a range of colors.
To generate a channel based on
luminance:
1 On the Channels palette, do one of
the following:
• To generate a new channel,
choose the RGB channel from
the list.
• To replace a channel, choose it
from the list.
2 Click the palette menu arrow, and
choose New From.
3 In the New From dialog box,
choose one of the following
options from the pop-up menu:
• Paper creates a channel using
the current paper texture.
• 3D Brush Strokes creates a
channel based on the difference
between the current image and
the clone source. If no clone
source is selected, Corel Painter
uses the current pattern. For
information about clones, refer
to “Cloning and Tracing” on
page 187.
• Original Selection imports the
selection from the clone source
document. You can use this fea-
ture to transfer a selection from
another document. For best
results, the dimensions of the
source and working document
should match. You must estab-
lish a clone source file, and cre-
ate a selection in this file, for
this option to be available. For
information about clones, refer
to “Cloning and Tracing” on
page 187.
• Image Luminance creates a
channel based on the current
image’s light and dark areas.
For Image Luminance to be
effective, the image must have
high contrast. Images with low
contrast will produce a semi-