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132 Layers and Masks<br />
You can create any number of new<br />
layers in your image. Each new one<br />
appears on top of the currently active<br />
layer, comprising a stack that you can<br />
view and manipulate with the Layers<br />
tab. We call these additional layers<br />
standard layers to differentiate them<br />
from the Background layer. Standard<br />
layers such as "Surfer Girl" and<br />
"Beach" opposite behave like<br />
transparent sheets through which the<br />
underlying layers are visible.<br />
Other types of layers also exist in <strong>PhotoPlus</strong>:<br />
• Shape layers are specifically designed to keep drawn lines and shapes<br />
(including QuickShapes) separate from the other layers so that they remain<br />
editable. (See Drawing and editing lines and shapes; p. 93)<br />
• Text layers, work like Shape layers, but are intended exclusively for Text. (See<br />
Creating and editing text; p. 90)<br />
• Adjustment layers apply corrective image adjustments to lower layers. (See<br />
Using adjustment layers; p. 138)<br />
• Filter layers, are much like standard layers, but you can apply one or more<br />
filter effects to the layer without permanently altering layer content. You also<br />
have full control over effects in the future. (See Using filter layers; p. 140)<br />
For now though we're concerned mainly with the Background and standard layers.<br />
A key distinction is that pixels on the Background layer are always opaque, while<br />
those on standard layers can vary in opacity (or transparency—another way of<br />
expressing the same property). That’s because standard layers have a “master”<br />
Opacity setting that you can change at any time (with on-screen real-time<br />
preview), while the Background layer does not. A couple of examples will show<br />
how this rule is applied in <strong>PhotoPlus</strong>:
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