Hi Aaron,
As far as I know, an alpha channel (transparency) is considered linear and not
subject to profile-based transformation. That says it should be perfectly
valid to have one - or not - in a profile-tagged image.
Not long ago Marti added the ability for LittleCMS to preserve extra channel
values as a transform is done by Little CMS (e.g. for passing alpha channel
data through unchanged). That reduced the application code needed to handle
RGBA and GA data if transforms are not done in place (i.e., from one buffer to
another).
-Noel
From: Aaron Boxer [mailto:boxe...@gmail.com]
Sent: Mon, February 27, 2017 9:33 AM
To: lcms-user@lists.sourceforge.net
Subject: [Lcms-user] ICC Monochrome Input Profile and alpha
Not directly related to lcms, but I have a question about the Monochrome Input
Profile:
is it valid to have an image with this profile, and to also have an alpha
channel ?
Thanks,
Aaron
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