Re: Tiff with mask
Re: Tiff with mask
- Subject: Re: Tiff with mask
- From: John Nestor <email@hidden>
- Date: Mon, 18 Feb 2002 15:26:18 -0500
Would someone explain premultiplication in this context. If I make a PS
file with an alpha channel
and save it as a tif I get the results I expect (used as icons in
buttons for instance). Am I implicitly
premultplying when I do this?
Raphael Sebbe wrote:
Actually, opaque is 1.0 and transparent is 0.0 (or if using 8bit
components, respectively 255 and 0).
Also, as I saw another message was about premultiplying the TIFFs,
don't forget this is a lossy process and you should keep the original
file as well - the one not premultiplied (Photoshop) - (in the case
you want to later change the alpha channel...)
Raphael
On Monday, February 18, 2002, at 03:46 PM, Ondra Cada wrote:
Mamdouh,
Mamdouh (M) wrote at Sun, 17 Feb 2002 22:20:52 +0100:
M> So my question is how do i make tiff4s with masks?
You don't. TIFFs don't support masks. They support much better thing
-- the
alpha channel. Just set whatever part of your image which should be
transparent to have full alpha, and whantever part which should be
opaque to
have zero alpha.
BEsides, you can use all the values between 0 and 1 to have partially
transparent parts of image, which is something mask would never allow
you.
---
Ondra Cada
OCSoftware: email@hidden http://www.ocs.cz
2K Development: email@hidden http://www.2kdevelopment.cz
private email@hidden http://www.ocs.cz/oc
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