From mitch at bermita.com  Fri Dec 12 02:11:23 2008
From: mitch at bermita.com (Mitch Berkson)
Date: Thu, 11 Dec 2008 21:11:23 -0500
Subject: [cl-pdf-devel] Producing a png with transparent background for use
	in pdf
Message-ID: <4941C84B.5000301@bermita.com>

I have a png file that I edited in the GIMP to make the background 
transparent.  I used "Color to Alpha".  When I try to pdf:make-image it, 
I get the error that alpha channel is not supported.  In the cl-pdf 
mailing list archive, I see that Marc said that alpha channels are not 
supported but transparency is.

How can I modify my png to have a transparent color without using the 
alpha channel? Thank you.

Mitch Berkson



From mitch at bermita.com  Fri Dec 12 11:56:35 2008
From: mitch at bermita.com (Mitch Berkson)
Date: Fri, 12 Dec 2008 06:56:35 -0500
Subject: [cl-pdf-devel] Producing a png with transparent background for
 use	in pdf
In-Reply-To: <4941C84B.5000301@bermita.com>
References: <4941C84B.5000301@bermita.com>
Message-ID: <49425173.5040001@bermita.com>

> How can I modify my png to have a transparent color without using the 
> alpha channel? Thank you.

After some more looking, I found this description of how to use the GIMP 
to make a transparent png image using indexed color:

http://mcapewell.wordpress.com/2006/09/07/how-to-make-a-transparent-png-image-for-ie-6-in-the-gimp/

Mitch Berkson