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Message-ID: <C068A5B3955E6C408A2EC2E3DEB6F88905D20BF8@SJMB001EX.retail.littlewoods.co.uk>
From: "Hulme, Phil" <Phil.Hulme@littlewoods.co.uk>
To: "'Chris Cox'" <ccox@adobe.com>
Cc: "'tiff@olympiakos.com'" <tiff@olympiakos.com>
Subject: RE: Photoshop Alpha Channel
Date: Wed, 6 Mar 2002 08:55:29 -0000 
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Chris, I apologise if the wording caused offence.
I think this partly answers my question so a more specific one is now what
is the simplest way to change an existing channel from type 1 (associated)
to type 0 (unspecified) so I can access it from the Photoshop channels
palette.
	Thanks
		Phil

P.S. to those who have complained about my signature I'm sorry but I have
absolutely no control over this as it is added on the way out through the
companies firewall.

At 2:53 PM +0000 3/5/02, Hulme, Phil wrote:
>Hello All,
>	I'm looking for some help with adding a grayscale TIFF to a CMYK
>tiff as a photoshop alpha channel. I know that Photoshop does not mark
these
>in strictly the correct way. Can any one suggest how I can achieve this?

What do you mean "not mark these in strictly the correct way"?
Photoshop writes the transparency channel as type 1 (associated), and 
additional channels get marked as type 0 (unspecified) because we 
don't know how the user intends to use them.

Any additional, non-associated channels you put in the TIFF file will 
be read as alpha channels by Photoshop.
Only one associated channel will be read by Photoshop, as transparency.

Chris

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