associated alpha
Bob Friesenhahn <[email protected]> Thu, 3 Feb 2005 21:59:47 -0600 (CST)
| Newsgroups | gmane.comp.video.graphicsmagick.core |
|---|---|
| Message-ID | <[email protected]> |
For as long as I can remember, ImageMagick (and GraphicsMagick) has been tagging TIFF files with an alpha channel with the "EXTRASAMPLE_ASSOCALPHA" flag. However, associated alpha means that the image pixels are premultiplied with the alpha channel. GraphicsMagick does not support premultiplied alpha. I believe this means that GraphicsMagick should be tagging the alpha channel with the EXTRASAMPLE_UNASSALPHA flag instead. Does anyone disagree with this? Bob ====================================== Bob Friesenhahn [email protected] http://www.simplesystems.org/users/bfriesen ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl