Thanks, Moose. I use Picture Window Pro 7.0 as my image editor. I dug
into the documentation and found that I can take a sample image made
with a given lens, pull a broken line to the edge that I want to
straighten, hit compute, and it will calculate polynomial corrections to
remove the barrel distortion. This can then be saved for that lens, and
recalled any time the correction is required.
With a few iterations, I got a perfect match to the in-camera JPG
image. While not an automatic solution, it only adds one step to my
work flow, and only for problem images.
It will even work with fisheye lenses.
Jim Nichols
Tullahoma, TN USA
On 2/9/2016 3:14 AM, Moose wrote:
On 2/8/2016 9:58 PM, Jim Nichols wrote:
If I may join this thread, I must admit that I learned something new
(to me) today. I have noticed that, starting with a RAW file, I
sometimes get some barrel distortion when capturing horizontal lines
with the X-E1 and 35/2 lens. When I look at the camera-produced JPG,
most of the distortion is missing. I concluded from this that the
lens corrections are missing from the RAW files.
Is this correct?
Yep, it's a RAW file, and thus not processed to correct the linear
distortion, or anything else. The information to make the corrections
is in the RAW file. The RAW converter makes the correction as part of
the conversion from RAW to general purpose formats.
In the case of µ4/3 RAW files, Oly Viewer 3 and ACR/LR automatically
make the corrections, and in fact, that can't be turned off. So their
outputs exactly match the JPEGs that were corrected in camera. DxO
Optics Pro doesn't use the manufacturers' settings, but uses their
own, from their own testing, and one may turn correction on and off.
In limited testing, their corrections were better than the defaults in
ACR.
I know exactly nothing about Fuji RAW files and conversion, but there
is undoubtedly a way to make distortion correction a part of the
conversion process.
Straight Lines Moose
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