On Tuesday 21 July 2009 01:58:33 pm James Cobban wrote:
> I am trying to combine images scanned from microfilm in the case
> where the lens on the microfilm scanner is too powerful to permit
> me to scan an entire page into a single image file.  I believe
> that this application is similar to trying to create a landscape
> from multiple photographs.
> I scan the original into a PDF containing multiple images.  I
> then open this PDF as layers.  I have been able to rearrange the
> layers, raise and lower them, and merge them to create a single
> image file, but I have 2 problems:
> 1) Sometime the key spots within the layers which I need to line
> up prior to merging the layers are not right on the edge of
> either layer.  To perform the alignment I need to make at least
> the outer portion of the upper layer partially transparent so I
> can properly align them.
> 2) Once I am finished the contrast between the two layers is
> generally such that the edge of the upper layer is clearly
> visible in the merged result. Once again if I could make the
> outer edge of the upper layer transparent on a gradient to fully
> transparent at the edge, I could make the edge invisible.  I
> think of this operation as "feathering" the layer, but searching
> through the documentation and web guides I can only find
> "feathering" as applicable to images, not layers.
> The following is an example of the result I currently have:
> http://www.jamescobban.net/Ontario/images/B1912_33007.jpg
> Combined image from microfilm.

This is described well in "The Artist's Guide to Gimp Effects", page 
47.  Basically it involves applying a gradient to a layer mask. 

John Culleton
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