On Tue, Dec 06, 2005 at 07:17:43PM -0800, Carol Spears wrote:
> On Tue, Dec 06, 2005 at 03:22:41PM -0800, [EMAIL PROTECTED] wrote:
> > On Tue, Dec 06, 2005 at 02:48:57PM -0800, Carol Spears wrote:
> > > On Tue, Dec 06, 2005 at 02:21:18PM -0800, [EMAIL PROTECTED] wrote:
> > > > 
> > > > I ended up with two images based on my mask, one with all black in
> > > > overexposed areas, one with all black in underexposed areas.
> > > > 
> > > adding a mask should only give you transparency or not transparent
> > 
> > It is confusing to me as to *what* is transparent though, as the actual
> > image is not modified until until I paste in my black/white mask (at least
> > the way I used it, and I thought you explained it).
> > 
> well, i did not say anthing about layer mode.  my idea of what you might
> have done is very confused by the introduction of this word into the
> description of what you did.

Well you explained how to apply the mask.

But yeh, I could not figure out a way to combine the resulting two masked
images with a mask. Reading gimp documentation/help about masks has not
helped so far :-( 

> > > > I copied one to a new layer in the other, and selected "addition" as the
> > > > layer mode.
> > > > 
> > > a layer mode is not a layer mask.  the mask is an easy way to have
> > > transparency.  the mode mixes the pixels of two layers mathematically.
> > 
> > So, is the best way to combine these images to use layers?
> > 
> it might be a good time to put the image online.  

below ...

> after the mask introduces the transparency to one layer, the mode can be
> used to change how the remaining pixels interact with the layer below
> it.  transparency occurs to one layer.  you can see the layer below, but
> it is visual only.  mode involves two layers.  it is much more
> complicated to explain and the introduction of it here makes the
> discussion almost uselessly complicated.

> > > > I have to clean up the mask edges (they are blurred already but need 
> > > > more
> > > > changes) and/or etc.
> > > > 
> > > the levels tool has been useful to me for making blurry images less
> > > blurred.
> > 
> > The image is sharp, I mean I used the gaussian blur to avoid hard edges on
> > my mask.
> > 
> so are you saying that you successfully cleaned up the mask images or
> that you still need to?

I'm saying I cleaned it up some, but it might need further cleanup. 

I did just did everything again (on 1/4 size images ... so I need one
another take), and cleaned out specks in the mask.

Here's an image showing the two images I started with (using the Canon raw
image, I created the two images on the left with different exposures), and
the mask I created using the threshold:


Using the above with layer masks, (plus the invert of the threshold mask),
I can create the following two (below on left and right), and then combine
these in two layers with "addition" mode to create the final image on the
far right:


The final image is not much better than the darker image I started with :-(

Anyway, it's just hard to get good photos with a snow background,
especially white-on-white of the dog and snow.

I have another image I want to try this on, even if this didn't get
much improvment.

-- Patrick Mansfield
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