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From: saito <saitology9@gmail.com>
Newsgroups: comp.lang.tcl
Subject: Re: Image background
Date: Thu, 17 Oct 2024 15:52:16 -0400
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On 10/17/2024 3:35 PM, Rich wrote:
>        imageName transparency set x y boolean
>           Makes the pixel at (x,y) transparent if boolean is true,
>           and makes that pixel opaque otherwise.
> 

On that same page, there is a -background option which is just the 
opposite of what I was looking for:

	-background color
	If the color is specified, the data will not contain any transparency 
information. In all transparent pixels the color will be replaced by the 
specified color.