2009.04.27 19:49 "[Tiff] Question regarding unassociated alpha", by Amir Ebrahimi
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2009.04.27 20:00 "Re: [Tiff] Question regarding unassociated alpha", by Chris Cox
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2009.04.27 20:03 "Re: [Tiff] Question regarding unassociated alpha", by Amir Ebrahimi
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2009.04.27 20:07 "Re: [Tiff] Question regarding unassociated alpha", by Chris Cox
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2009.04.27 20:26 "Re: [Tiff] Question regarding unassociated alpha", by Edward Lam
- 2009.04.27 20:28 "Re: [Tiff] Question regarding unassociated alpha", by Edward Lam
- 2009.04.27 20:32 "Re: [Tiff] Question regarding unassociated alpha", by Amir Ebrahimi
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2009.04.27 20:26 "Re: [Tiff] Question regarding unassociated alpha", by Edward Lam
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2009.04.27 20:07 "Re: [Tiff] Question regarding unassociated alpha", by Chris Cox
- 2009.04.27 21:14 "Re: [Tiff] Question regarding unassociated alpha", by Daniel McCoy
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2009.04.27 20:03 "Re: [Tiff] Question regarding unassociated alpha", by Amir Ebrahimi
2009.04.27 20:07 "Re: [Tiff] Question regarding unassociated alpha", by Chris Cox
Probably a bug.
Lots of people get alpha channels confused with transparency (associated alpha), especially in the 3D and video world. They forget that you can have alpha channels that are not transparency(associated) and you can have more than 1 alpha channel in a single file.
Chris
________________________________________
From: Amir Ebrahimi [amir@unity3d.com]
Sent: Monday, April 27, 2009 1:03 PM
To: Chris Cox
Cc: tiff@lists.maptools.org
Subject: Re: [Tiff] Question regarding unassociated alpha
On Apr 27, 2009, at 1:00 PM, Chris Cox wrote:
Unassociated alpha should never be premultiplied - it is not associated with the color channels. Only assoicated alpha should be premultiplied.
Chris
I agree. Why is libtiff doing this?