Dear HDRI list members,
I use HDRShop to convert between mappings for environment maps, e.g.,
from mirror ball to lat-long, etc.
I use a Sigma 8mm 180 degree field-of-view fish eye lens on a Canon 1Ds
Mark II camera to take fish eye lens (FEL) images of the sky.
In HDRShop I use the "mirror ball closeup" option when I convert from
FEL image to lat-long mapping, but through experiments I have determined
that the mapping is incorrect. The FEL imaging geometry does not conform
to "mirror ball closeup" and the resulting lat-long mapping is
incorrect. For example: when I take FEL images of the sky, and manually
measure the elevation of the Sun above the horizon, the elevation
matches if I interpret the FEL image as a hemispherical mapping. If I
convert (using the mirror ball closeup option) the FEL image to lat long
in HDRShop the elevation is not correct anymore (e.g, 7 degrees in
lat-long map, 20 degrees in reality).
I am searching for a program that can convert my FEL images (produced
with the Sigma 8mm FEL) correctly into lat-long format. Can anyone help?
Or put more precisely: I wish to convert hemispherical images into
latitude-longitude format.
Sincerely,
Claus
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