Adobe photoshop elements 用户手册

ADOBE PHOTOSHOP ELEMENTS

In the options bar, select Use All Layers.

You can quickly select all the opaque areas on a 
layer within the layer boundaries. This is useful 
when you want to exclude transparent areas from 
a selection.

Do one of the following:

In the Layers palette, Ctrl-click (Windows) or 

Command-click (Mac OS) the layer thumbnail.

Right-click (Windows) on the layer thumbnail 

in the Layers palette.

To add the pixels to an existing selection, press 

Ctrl+Shift (Windows) or Command+Shift 
Mac OS), and click the layer thumbnail in the 
Layers palette.

To subtract the pixels from an existing selection, 

press Ctrl+Alt (Windows) or Command+Option 
(Mac OS), and click the layer thumbnail in the 
Layers palette.

To load the intersection of the pixels and an 

existing selection, press Ctrl+Alt+Shift (Windows) 
or Command+Option+Shift (Mac OS), and click 
the layer thumbnail in the Layers palette.

Keep in mind that a layer’s opacity and blending 
mode interact with the opacity and mode of the 
tools you use to paint and edit the pixels on the 
layer. For example, suppose you are working on a 
layer that uses the Dissolve mode and an opacity of 
50%. If you paint on this layer using the paint-
brush tool set to Normal mode with an opacity of 
100%, the paint will appear in Dissolve mode with 
a 50% opacity because this is the maximum the 
layer can display. On the other hand, suppose you 
are working on a layer created using Normal mode 
and 100% opacity. If you use the eraser tool with 
an opacity of 50%, only 50% of the paint will 
disappear as you erase.