Adobe Photoshop CS3 Manual de usuario descargar pdf (Pagina 409)

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PHOTOSHOP CS3

User Guide

402

Use the Texture Channel in the Lighting Effects

The Texture Channel in the Lighting Effects dialog box lets you control lighting effects using grayscale images (called

bump maps)thatyouaddtoyourimageasalphachannels.Youcanaddanygrayscaleimagetoyourimageasanalpha

channel, or create a new alpha channel and add texture to it. For an embossed text effect, use a channel with white

text on a black background, or vice versa.

1 If necessary, add an alpha channel to your image. Do one of the following:

• To use a texture based on another image (for example, fabric or water), convert that image to grayscale, then drag

the grayscale channel from that image into the current image.

• Drag an existing alpha channel from another image into the current image.

• Create an alpha channel in your image, then add texture to it.

2 In the Lighting Effects dialog box, choose a channel from the Texture Channel menu: either an alpha channel

you’ve added or the image’s Red, Green, or Blue channel.

3 Select White Is High to raise the white parts of the channel from the surface. Deselect this option to raise the dark

parts.

4 Drag the Height slider to vary the texture from Flat (0) to Mountainous (100).

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Adobe Photoshop CS3 Manual de usuario Pagina 409

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