Epson Photo Plus - PhotoPlus Color Photo Scanner User's Guide download pdf (Page 52)

40 Layers and Masks

Adjusting opacity/transparency

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

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.

Fully opaque text

(100% Opacity)

Semi-transparent text

(50% Opacity)

Opacity and transparency describe essentially the same thing (like "half full"

and "half empty"). They both describe the extent to which a particular pixel's

color contributes to the overall color at that point in the image.

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 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 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!

As a property of individual standard layers (in example above). The layer's

opacity setting affects all the pixels on the layer, and is cumulative with the

opacity of individual pixels already there.

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).

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Epson Photo Plus - PhotoPlus Color Photo Scanner User's Guide Page 52