Monkey <[email protected]> commented on Wed, 22 Apr 2015 at
04:53:56 -0700 (PDT):
"The blurred patch [in Terry Duell's screenshot of Tue, 21 Apr 2015 at
17:37:32 +1000] is not down to the blending as such, but is already
present in scan-1.jpg."
I don't see that. True, there is blurring by the right-hand edge of the
image, presumably due to a lifting of the original at the edge of the
scanning area, and similar blurring, no doubt for a corresponding
reason, by the left-hand edge of tscan-2.jpg. But in neither is there
significant blurring in the region of the most noticeable blurring in
Terry's enblend example, which is around the central vein of the nearly
vertical leaf on the right of the stitched image, which is rotated with
respect to the original scans in order to orient it correctly. Whatever
is going on looks to me to be more than just a result of the positioning
of the seam.
I am not sure if the following is the sort of information Terry is
seeking, but I stitched the two scanned images using the Windows 64-bit
version of Hugin, 2014.0.0.5da69bc383dd built by Matthew Petroff. As
far as I can see, it uses Enblend version 4.1.3, 19 March 2014. I
followed the tutorial by optimising X, Y Z and roll for Image 2, with
the fov set at 10 deg (I persist in using only a single lens, since
there is no need to vary the parameters per image). That yielded a
stitch with no noticeable blurring, as in the other blender examples in
Terry's screenshot. However, when I superimposed the two remapped
images there proved to be a slight discrepancy in the area of the
blurred central vein, amongst other places, of roughly the width of the
lines defining the vein. Even if the seam had included a very broad
band of feathering it could not, I should have thought, have produced
the blurring seen. And there was a slight jink noticeable in the
left-hand border of the image area in the stitched output. Of course
both these imperfections might be the result of a poor choice of control
points.
Roger Broadie
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