Serif PhotoPlus X3 ECD518624M 用户手册
产品代码
ECD518624M
Layers and Masks
151
Varying opacity is rather like lighting a gauze backdrop in a theater: depending
on how light falls on it, it can be rendered either visible or invisible, or in
on how light falls on it, it can be rendered either visible or invisible, or in
between. Fully opaque pixels contribute their full color value to the image. Fully
transparent pixels are invisible: they contribute nothing to the image. In-
between pixels are called semi-transparent. You'll primarily encounter opacity in
between pixels are called semi-transparent. You'll primarily encounter opacity in
one of these two contexts:
•
As a property of the pixels laid down by individual tools (Paintbrush,
Clone, Eraser, Fill, Smudge, QuickShape, and more) . When you paint
Clone, Eraser, Fill, Smudge, QuickShape, and more) . When you paint
on-screen with one of these tools, you're applying pixels—pixels that
are more or less opaque, depending on the tool's opacity setting. Note
are more or less opaque, depending on the tool's opacity setting. Note
that once you've applied paint to a region, that's it—you've changed
the opacity of pixels there. Subsequently changing a tool's opacity
setting won't alter brush strokes you've already laid down!
setting won't alter brush strokes you've already laid down!
•
As a property of individual standard layers (as in the example above).
The layer's opacity setting affects all the pixels on the layer, and is
The layer's opacity setting affects all the pixels on the layer, and is
cumulative with the opacity of individual pixels already there.
A tool or layer's blend mode interacts with its opacity setting to
produce varying results. For details, see Using blend modes on p. 147.
To set a tool's opacity:
•
Select the tool (e.g., Paintbrush Tool) and from the Context toolbar
either enter a percentage Opacity value directly or use the slider (click
the option's right arrow button).
either enter a percentage Opacity value directly or use the slider (click
the option's right arrow button).
To set a layer's opacity:
•
Select the layer in the Layers tab and adjust the Opacity setting at the
top of the tab—either enter a percentage Opacity value directly or use
the slider (click the option's right arrow button). The layer's opacity
top of the tab—either enter a percentage Opacity value directly or use
the slider (click the option's right arrow button). The layer's opacity
will change on-screen as the slider is adjusted.
To read the opacity values of pixels on the active layer:
1. Select the
Color Pickup Tool from the Tools toolbar and move it
around the image.