Corel Painter X3 Win/Mac, EDU, EN Guia do Utilizador Página 556

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Alpha Channels 533
2 Click the Channel options button , and choose New From Color Range.
3 With the Color dialog box open, click in the document window to pick a color.
4 The color you select is the middle of the range of colors used to create the channel.
5 In the Color dialog box, adjust the H Extents (hue), S Extents (saturation), and V
Extents (value) sliders.
These sliders control the selected range. You can drag the limits of the range in
either direction.
6 Adjust the H Feather (hue), S Feather (saturation), and V Feather (value) sliders
to control the feathering at the edges of the color space extents.
This helps soften the edges of the channel.
If you want to invert the channel, click the Invert Channel button .
The channel displays as a red overlay on the image in the Preview window of
the Color dialog box. You can drag in the Preview window to display other
parts of the image.
Importing and exporting alpha channels
When you save a file to the Corel Painter file format (RIFF), the alpha channels that are
stored in the file are retained. They are also retained when exporting Corel Painter files
in the Adobe Photoshop (PSD) format. In addition, if you import an Adobe Photoshop
file that contains alpha channels in Corel Painter, the alpha channels are supported.
It is important to note that when you open RGB-based Adobe Photoshop files in
Corel Painter, anything in the alpha channels (#4 and above) appear as a channel in
Corel Painter. Conversely, when you export your Corel Painter file in the Photoshop
format, all channels are placed into channels #4 and above.
Selecting and viewing channels
You can select and view all alpha channels that are stored in the active document from
the Channels panel. Selecting and viewing a channel are distinct operations — you can
view a channel without selecting it, and you can select a channel without viewing it. If
you want to edit a particular channel, you must select it.
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