Microsoft Knowledge Base

HOWTO: Apply Effects to a Region Defined by the Alpha Channel
Last reviewed: April 25, 1997
Article ID: Q167432
The information in this article applies to:
  • Softimage Eddie for IRIX, versions 3.2a, 3.2b

SUMMARY

This article demonstrates how to apply an arbitrary effect, such as Color map or Mix, so that it only affects the region that is defined by the alpha channel.

MORE INFORMATION

To implement this procedure, do the following:

  1. Attach the image that has an alpha channel defining a specific region to the source target.

  2. Attach the same image to the OptionalBackground target of that tool.

  3. In the Input Editor, select the A-atop-B blend (the fifth one from the left in the top row).

As you modify the parameters, the changes only occur inside the region defined by the alpha channel.

REFERENCES

If you have any questions concerning the information contained in this article, contact support@softimage.com by e-mail.

Keywords : kbgraphic kbusage si kbhowto
Version : 3.2a 3.2b
Platform : IRIX
Issue type : kbhowto

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Last reviewed: April 25, 1997
©1997 Microsoft Corporation. All rights reserved. Legal Notices.