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| The isolate and protect part of an image. When you create a mask based on a selection, the area that you haven't selected is masked or protected from editing. |
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| They store an images color information. Unlike layers channels do not print. You use channels to view and work with alpha channels. |
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| Black hides and white reveals |
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| saving a working version of the file lets you return to the original if you need to. |
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| Press Ctrl+spacebar (windows) or Command+spacebar (Mac OS) to temporarily use the zoom inn tool. When your done release the tool to go back to whatever tool you were using. |
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| Press the Atl+spacebar (windows) or Option+spacebar (Mac OS) to temporarily use the zoom out tool. When your done release the tool to go back to whatever tool you were using. |
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| You can find it in the view mode area of the dialog box, click the arrow next to the preview window. choose on black on the pop-up menu. The black the background can make it easier to see any white edges you may have missed on the selection. |
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| This means that you can edit the mask later without loosing any pixels that they hide. |
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| Choose Layer>Layer Mask>Disable. A red X appears over the mask thumbnail in the layer mask when the mask is disabled. |
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| Turning the layer mask back on |
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| Choose Layer> Layer Mask> Enable. If the mask does not show up in the layers panel, choose Layer>Layer Mask> Reveal all to display it |
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| To unlink a layer o group from its layer mask or vector mack |
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| click the link icon between the thumbnails in the layers panel. |
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| Click the blank space between the two thumbnails. |
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| To convert a vector mask to a layer mask |
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| Select the the layer containing the vector mask you want to covert, and choose Layer> Rasterize> Vector Mask. You can not change a a rasterize vector mask back into a vector object. |
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| Use the Density and Feather sliders in the properties panel. |
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| It determines the opacity of the mask: at 100%, the mask is fully in effect; at lower opacities, the contrast lessens; and at 0%, the mask has no effect |
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| It softens the edge of the mask. |
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| When using a painting or editing tool in Quick Mask mode, Keep these principles in mind: |
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Painting with black adds to the mask (the red overlay) and decreases the selected area.
Painting with white erases the mask (the red overlay) and increases the selected area.
Painting with gray partially adds to the mask. |
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| Gives you flexibility in manipulating an image. |
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| You'll use the mesh to place pins where you want to control movement (or to ensure there is no movement) |
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| Think of channels as containing an image's color and selection information; think of layers as containing painting and effects. |
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-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. |
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| Being specific with alpha channels |
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| They have the same dimensions and number of pixels as the original image. |
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| Editing the mask in alpha channel |
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| You can edit the mask in alpha channel using the painting tools, editing tools, and filters. |
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| Converting alpha channels |
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| You can convert alpha channels to spot-coclor channels. |
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