is the Alpha channel of a Tiff premultiplied?

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Old 10 October 2005   #1
is the Alpha channel of a Tiff premultiplied?

When rendering out from 3D Studio Max, I can choose either Tiff or TGA.

The TGA format has choices for premultiplied or non-premultiplied alpha channels whereas the Tiff option doesnt have these choices.

Is the alpha channel of a Tiff, premultiplied or nonpremultiplied?

/ Thanks
 
Old 10 October 2005   #2
Most 3D rendered elements have a pre-multiplied alpha unless specified otherwise.

-jeremy
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Jeremy Birn
Author, Digital Lighting & Rendering, 3rd Edition
 
Old 10 October 2005   #3
The answer is that an alpha channel is never premultipled. An alpha stores the value that the color gets multiplied with -- either before writing the image (premultiplied color) or after (the comp app or the like does it).

.mm
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Old 10 October 2005   #4
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