2001.12.03 15:58 "Extracting alpha channel from TIFF file?", by Peter Davis

I have a TIFF file which was created as a preview for an EPS file from Adobe Illustrator. I can open the TIFF by itself on Photoshop, and it seems to have both an alpha channel and a clipping path. If I open the EPS in Quark, the alpha channel is used to give the preview a transparent background.

Is there a way I can use the TIFF library or ImageMagick to read this alpha channel from the TIFF file and use it to create a clipping region on Windows 2000? (Once I can get the bits, I know I can create the region.) I've tried using the LEADTOOLS library, but this seems to ignore the transparency and displays the whole image as opaque.

Thanks very much,


     Peter Davis                               Pageflex Inc
     617-520-8345                          215 First Street
     617-868-0784 (FAX)                 Cambridge, MA 02142
     pdavis@pageflexinc.com      http://www.pageflexinc.com