I think those sample images were not the best that could have been chosen 
to illustrate flat stitching, with their abstract design and lack of visual 
clues as to orientation. I had to double check to make sure they hadn't 
been rotated as it's not immediately obvious, nor is it easy to gauge how 
the two images overlap just by looking at them.

I wonder if masking out the blurred areas would help.
>

Undoubtedly. The down side is that you rob yourself of image data that 
could still make a useful contribution to blending (even in this case - the 
fine lines might be blurred but the lower frequency information could still 
be useful).

I'd love to see some sort of seam hinting - perhaps some way of passing on 
to the blender that you don't want seams to cross a certain area, or to 
force them to follow a certain path. Blending water waves, for example, can 
be hard to do seamlessly, and one useful technique is to draw a meandering 
seam line. I did once write a (very basic) GUI that let you manipulate 
blending seams, but only between two images, and these days I use 
multiblend's --save-seams and --load-seams. I think the same thing is 
possible with Enblend, but is much more convoluted.

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