Hi Marco -

I've been working with some facets of digital images for a long time, but I
still don't completely understand everything about transparency.  In
particular, you mention one of the things here that I am confused about.
Could you please explain further exactly what transparency and alpha
channels have to do with each other?  Does the value of the alpha channel
provide the transparency level for each pixel, and if so, then what does
that have to do with "alpha"?  Also, how is level of transparency actually
applied in order compute the final display values for a pixel when a
semi-transparent pixel is overlaid onto an underlying non-transparent pixel?
Although the original question in this thread involved png files, I am more
interested in tiff files, but I suspect that essentially the same answer
applies to both.  Thanks!


----- Original Message ----- 
From: "Marco Wessel" <[EMAIL PROTECTED]>
Sent: Monday, October 13, 2003 10:49 AM
Subject: Re: [Gimp-user] What happened to transparency after flatten?

> On Mon, Oct 13, 2003 at 10:32:13AM -0500, Albert Wagner wrote:
> > I have several layered images developed for an animation. I built them
> > using a white background for ease in drawing. All other layers were
> > transparent.  For each I then deleted the background layer, flattened
> > the image, and saved as *.png. However, the flattened image still had a
> > white background, when I intended that it be transparent.  What did I do
> > wrong?
> >
> That's exactly what flatten is intended to do. If you want an alpha
> in your png, just use save as a png without flattening. It'll ask you to
> merge the visible layers for the export because png can't handle them, and
> save a png just like you want it to: with alpha channel.
> Marco Wessel
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