Corel Painter X3 Win/Mac, EDU, EN Guía de usuario descargar pdf (Pagina 555)

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532 Corel Painter X3 Getting Started Guide

• To replace a channel, choose it from the list.

2 Click the Channel options button , and choose New From.

3 In the New From dialog box, choose one of the following options from the list box:

• Paper — uses the current paper texture to create the channel

• 3D Brush Strokes — creates a channel based on the difference between the

current image and the clone source. If no clone source is selected, Corel Painter

uses the current pattern.

• Original Selection — works only when performing offset sampling between

documents. It allows you to create a channel in the sampling destination

document that is based on a selection made in the sampling source document.

For best results, the dimensions of the source and destination documents should

match. You must establish a link between an offset sampling source and

destination document for this option to be available. For more information, see

“Performing offset sampling” on page 165.

• Image Luminance — creates a channel based on the current image’s light and

dark areas. For Image Luminance to be effective, the image must have high

contrast. Images with low contrast produce a semisolid channel, without clear

delineation between the selected and protected areas.

• Original Luminance — produces a channel based on the clone source’s light

and dark areas. This option lets you import an image to the channel. If no clone

source is selected, Corel Painter uses the current pattern.

• Current Color — creates a channel based on pixels of the current main color.

Areas of the current color are protected; the rest of the image is selected. You

might want to use the Dropper tool to pick a color from the image before using

the Current Color option.

If you want to invert the channel, click the Invert Channel button .

Like a grayscale image, a channel can have 256 values in it. Inverting a

channel is equivalent to creating the negative of a grayscale image. For

example, a pixel with 80% luminance will have 20% luminance when

inverted. A pixel with 30% luminance will have 70% luminance when

inverted.

To generate a color-based channel

1 In the Channels panel, do one of the following:

• To generate a new channel, choose the RGB channel from the list.

• To replace a channel, choose it from the list.

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