Serif PhotoPlus X3 ECD518624M Manual De Usuario
Los códigos de productos
ECD518624M
Layers and Masks
137
A key distinction is that pixels on the Background layer are always opaque, while
those on standard layers can vary in opacity (or transparency—another way of
those on standard layers can vary in opacity (or transparency—another way of
expressing the same property). That’s because standard layers have a “master”
Opacity setting that you can change at any time (with on-screen real-time
preview), while the Background layer does not. A couple of examples will show
preview), while the Background layer does not. A couple of examples will show
how this rule is applied in PhotoPlus:
•
Suppose you are creating a new image. The New Image dialog
provides three choices for Background: White, Background Color, and
provides three choices for Background: White, Background Color, and
Transparent. If you pick White or Background Color, the Layers tab
shows a single layer in the new image named "Background." If you
shows a single layer in the new image named "Background." If you
pick Transparent, however, the single layer is named "Layer 1"—and in
this case, the image (typically an animation file) has no Background
layer.
layer.
•
If you cut, delete, or move a
selection on the Background
layer, the "hole" that's left exposes
layer, the "hole" that's left exposes
the current background color (as
shown on the Color tab). The
shown on the Color tab). The
same operations on a standard
layer expose a transparent hole.
Selections and layers
With few exceptions, you will work on just one layer at any given time, clicking
in the Layers tab to select the current or active layer. Selections and layers are
in the Layers tab to select the current or active layer. Selections and layers are
related concepts. Whenever there's a selection, certain tools and commands
operate only on the pixels inside the selection—as opposed to a condition where
operate only on the pixels inside the selection—as opposed to a condition where
nothing is selected, in which case those functions generally affect the entire
active layer.
If your image has multiple layers, and you switch to another layer, the selection
active layer.
If your image has multiple layers, and you switch to another layer, the selection
doesn't stay on the previous layer—it follows you to the new active layer. This
makes sense when you realize that the selection doesn't actually include image
makes sense when you realize that the selection doesn't actually include image
content—it just describes a region with boundaries. And following the old advice
"Don't confuse the map with the territory," you can think of the selection as a
kind of outline map, and the active layer as the territory.
kind of outline map, and the active layer as the territory.