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Channels are grayscale images that storedifferent types of information:

• Color information channels are created automatically when you open a new image. The image's color mode determines the number of color channels created. For example, an RGB image has a channel for each color (red, green, and blue) plus a composite channel used for editing the image.

• Alpha channels store selections as grayscale images. You can add alpha channels to create and store masks, which let you manipulate or protect parts of an image. (See About masks and alpha channels.)

• Spot color channels specify additional plates for printing with spot color inks. (See About spot colors.)

  An image can have up to 56 channels. All new channels have the same dimensions and number of pixels as the original image.

  The file size required for a channel depends on the pixel information in the channel. Certain file formats, including TIFF and Photoshop formats, compress channel information and can save space. The size of an uncompressed file, including alpha channels and layers, appears as the right-most value in the status bar at the bottom of the window when you choose Document Sizes from the pop‑up menu.

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Note:

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As long as you save a file in a format supporting the image's color mode, the color channels are preserved. Alpha channels are preserved only when you save a file in Photoshop, PDF, TIFF, PSB, or raw formats. DCS 2.0 format preserves only spot channels. Saving in other formats may cause channel information to be discarded.

TheChannels panel lists all channels in the image—composite channelfirst (for RGB, CMYK, and Lab images). A thumbnail of the channel'scontents appears to the left of the channel name; the thumbnailis automatically updated as you edit the channel.

ChoosePanel Options from the Channels panel menu. Click a thumbnail size orclick None to turn off the display of thumbnails.

Viewing thumbnails is a convenient way of tracking channelcontents; however, turning off the display of thumbnails can improveperformance.

Youcan use the Channels panel to view any combination of channels inthe document window. For example, you can view an alpha channeland the composite channel together to see how changes made in thealpha channel relate to the entire image.

Click in theeye column next to the channel to show or hide that channel. (Click thecomposite channel to view all default color channels. The composite channelis displayed whenever all the color channels are visible.)

Note:

To show or hide multiple channels, dragthrough the eye column in the Channels panel.

Individualchannels are displayed in grayscale. In RGB, CMYK, or Lab images,you can view the individual channels in color. (In Lab images, onlythe a and b channels appear in color.)If more than one channel is active, the channels always appear incolor.

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You can change the default to show the individual colorchannels in color. When a channel is visible in the image, an eyeicon appearsto its left in the panel.

• InWindows, choose Edit > Preferences > Interface.

• In Mac OS, choose Photoshop >Preferences > Interface.

You can select one or more channels in the Channelspanel. The names of all selected, or active, channelsare highlighted.

• To select a channel, click the channelname. Shift-click to select (or deselect) multiple channels.
• To edit a channel, select it and then use a paintingor editing tool to paint in the image. You can paint on only onechannel at a time. Paint with white to add the selected channel'scolor at 100% intensity. Paint with a value of gray to add the channel'scolor at a lower intensity. Paint with black to fully remove the channel'scolor.

You can move alpha or spot channelsabove the default color channels only if the image is in Multichannelmode (Image > Mode > Multichannel). For information aboutthat mode's limitations, see Multichannelmode.

• To change the order of alpha or spot channels, drag the channel up or down in the Channels panel. When a line appears in the position you want, release the mouse button.

Note:

Spot colors are overprinted in the order of their appearance from top to bottom in the Channels panel.

• To rename an alpha or spot channel, double-click the channel's name in the Channels panel, and enter a new name.

For more information, see Createa new spot channel.

You may want to delete spot or alpha channelsyou no longer need before saving an image. Complex alpha channelscan substantially increase the disk space required for an image.

In Photoshop, select the channel in the Channelspanel and do one of the following:

• Alt-click (Windows) or Option-click (Mac OS)the Delete icon .

• Drag the channel name in the panel to the Deleteicon.

• Choose Delete Channel from the Channels panel menu.

• Click the Delete icon at the bottom of the panel,and then click Yes.

Note:

Whenyou delete a color channel from a file with layers, visible layersare flattened and hidden layers are discarded. This is done becauseremoving a color channel converts the image to Multichannel mode,which does not support layers. An image isn't flattened when youdelete an alpha channel, a spot channel, or a quick mask.

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