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December 2001

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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,

-pd



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