Re: Gimp and Alpha-Masks

On Sun, 2006-10-01 at 21:13 +0100, Bruno Postle wrote:
> On Sun 01-Oct-2006 at 12:28 -0700, JD Smith wrote:
> >
> > So, how are people pre-editing their alpha masks before sending to  
> > enblend?  By using the large and wasteful full TIFF output, and  
> > adding the MASK by hand?  Or am I missing something simple?
> 
> I don't use multilayer TIFFs because enblend can't read them (and 
> gimp can't save them).  So I use TIFF_m output for separate files.
> 
> I'm working with 16bit images, so I edit the output from nona in 
> cinepaint and add the alpha masks there.  Cinepaint seems to 
> preserve the cropped TIFF offsets without problems.
> 
> I then pass these separate files to enblend and it all seems to 
> work out ok.

Thanks Bruno.  I'm amazed... no other software gets it right.  Can you
check one of these cinepaint-edited files with tiffinfo to see if the
"Position: " is really there?  

You had mentioned before some scripts to allow saving masks as simple
grayscale "to the side", applied just before enblend runs, with some
magic to interpret 3 mask levels (0, 255 and other, corresponding to
"ignore", "keep for this image", "keep only in this image").  Have you
found a way to inject a changed alpha into a pre-existing cropped TIFF?
I struggled to find something which would do this, but came up empty
handed.

JD

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