Corel Painter X3 Win/Mac, EDU, EN Podręcznik Użytkownika Pobierz pdf (Strona 552)

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Alpha Channels 529

Alpha Channels

Alpha channels, also referred to simply as channels, let you store and edit path-based

and pixel-based selections in an active document. Corel Painter stores only the current

selection by default, therefore, when you make a new selection, your previous selection

is automatically lost. However, by saving the selection as an alpha channel, you can

retain the selection information and load it in the image whenever you need it.

The alpha channel is a grayscale image that stores 8 bits of information per pixel,

which means that each pixel can be assigned one of 256 levels of gray — from 0

(black) to 255 (white). White areas of the channel are selected, and black areas of the

channel are protected. Intermediate levels of gray are partially protected. For example,

areas that are 50% gray will allow 50% of the brushstroke or effect to get through the

channel to the image.

This section contains the following topics:

• Creating and copying channels

• Generating channels automatically

• Importing and exporting alpha channels

• Selecting and viewing channels

• Setting channel attributes

• Deleting and clearing channels

• Editing channels

Creating and copying channels

You can create a channel from a selection, create a blank channel, or create a new

channel by copying an existing channel. The channels are saved with the image and

remain part of the file. Channels remain inactive (for canvas control) until you load them

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