Apple MA434Z/A User Manual - Page 416

To return to viewing the RGB channels, do one of the following: m Position the pointer in the Viewer, then press C. m Click the View Channel button, then choose the RGB channel option from the pop-up menu. To display the R, G, or B channels individually, do one of the following: m Press R to display the Red channel. m Press G to display the Green channel. m Press B to display the Blue channel. m Click the View Channel button, then choose a color channel from the pop-up menu. m Right-click the View Channel button, then choose a color channel from the shortcut menu. Changing the Number of Image Channels As stated above, certain operations automatically add or remove channels. For example, the Emboss and Monochrome nodes change an RGB image to a BW image, and a non-uniform Add node changes a BW image to an RGB image. You can also explicitly change the number of channels in an image with specific nodes. The following nodes also potentially modify image channels: Node Color-Add Color- Brightness Layer-Copy Filter-Emboss Color- Monochrome Color-Mult Color-Reorder Effect Adds R, G, B, A, or Z. Removes RGB. Operation A value raised above 0 creates the specified channel. A brightness value set to 0 removes the RGB channels. Adds R, G, B, A, or Z. Copies a channel from the second input to the example. If you copy Z, the second image must have the Z channel. Turns an RGB image to a This, of course, radically alters your image. BW image. Turns an RGB image to a Uses a luminance balance, but you can adjust this to BW image. push specific channels. Removes R, G, B, A, or Z. Setting the R, G, B, A, or Z to 0 removes the specified channels. Adds or removes R, G, B, A, or Z. By using n or 0, you remove the specified channel: • rgbn or rgb0 removes the alpha channel. • rgbal adds the luminance into the Z channel, thereby creating a Z channel. • rrra creates a 2-channel image, assuming the "a" channel is not black. • 000a or nnna turns the image into a 1-channel alpha image. 416 Chapter 15 Image Processing Basics