BugBear wrote on Thu, 09 Oct 2014 1at 4:54:22 +0100 about the presence
of stitching glitches in photomosaics.
He pointed out that if the individual transformed images of the sample
photomosaic we were investigating (a map of the English cathedral city
of Norwich) were loaded in a stack errors were visible.
Actually, in my post of 8 October, by stitching glitches I merely meant
those that are visible in the final output.
Certainly there are mismatches in the remapped images where they
overlap, as is, I think, not unusual. But in theory, for any given
point, the stitcher should allow only one version of it through to the
final product and I can'’t see that differences between that version and
those from other images that are invisible in the final product are
directly relevant. In the map we have been looking at the stitcher has
been generally able to make a good choice and even where distortions are
visible it is clear that they originate from the remains of folds.
Nonetheless, the discrepancies between the different remapped images are
a reminder that the final photomosaic is not to be relied on as an
accurate scaled-down reproduction of the original, much though one would
like it to be.
Roger Broadie
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