Adobe Photoshop CS2 CLASSROOM IN A BOOK [Electronic resources] نسخه متنی

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Adobe Photoshop CS2 CLASSROOM IN A BOOK [Electronic resources] - نسخه متنی

Anita Dennis

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Saving a selection as a mask


Quick masks are temporary. They disappear as soon as you deselect. However, you can save a selection as an alpha-channel mask so that your time-consuming work won't be lost and you can reuse the selection in this work session or a later one. You can even use alpha channels in other Photoshop image files.

To avoid confusing channels and layers, think of channels as containing an image's color and selection information; think of layers as containing painting and effects.

NoteIf you save and close a file while in Quick Mask mode, the quick mask will show in its own channel the next time you open the file. If, however, you save and close your file while in Standard mode, the quick mask will be gone the next time you open your file.


1.

In the Layers palette group, click the Channels tab to bring that palette forward, or choose Window > Channels.

In the Channels palette, the default color-information channels are listeda full-color preview channel for the RGB image and separate channels for red, green, and blue.

NoteYou can click eye icons () in the Channels palette to hide and display individual color channels. When the RGB channel is visible, eye icons also appear for all three individual channels, and vice versa. If you hide one of the individual channels, the eye icon for the composite (the RGB channel) also disappears.

2.

With the (Standard mode) egret selection still active in the image window, click the Save Selection as Channel button () at the bottom of the Channels palette.

A new channel, Alpha 1, appears at the bottom of the Channels palette.

3.

Double-click the Alpha 1 channel, type Egret to rename it, and press Enter (Windows) or Return (Mac OS).

When you select the channel, Photoshop displays a black-and-white of the egret selection in the image window, and it hides all the color channels.

4.

Choose Select > Deselect to deselect the egret.



Using alpha channels


Here are some useful facts about alpha channels:

An image can contain up to 56 channels, including all color and alpha channels.

All channels are 8-bit grayscale images, capable of displaying 256 levels of gray.

You can specify a name, color, mask option, and opacity for each channel. (The opacity affects the preview of the channel, not the image.)

All new channels have the same dimensions and number of pixels as the original image.

You can edit the mask in an alpha channel using the painting tools, editing tools, and filters.

You can convert alpha channels to spot-color channels.


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