On 1/5/2017 11:00 PM, Stanley Halpin wrote:
Been done before I am sure. I had heard since forever that LR could
not take advantage of pixel-shifted files from the K-3ii or K-1. But
I saw a discussion recently that implied to me that LR did work. As
part of my recent look at the Leica-M adapter for K mount, I shot
some of the images with pixel shift turned ON.
Following a recent discussion on a Facebook pentax group, I did a bit
more and a comparison.
1. Pixel shift does seem to make a difference in resolution. My test
was not the best. 2. Pixel shift -> files about 3.5 times the size of
a “normal” K-1 DNG. 3. Lightroom does not know how to process such
files. 4. Lightroom generates color artifacts when processing such
images. 5. If the weather ever warms up I’ll go to the storage
locker, retrieve the disc that came with the camera, and redo this
using Pentax’s version of silkypiks.
Where I really notice the difference is in reds, flowers especially.
They don't blow out as fast.
I'm surprised Lightroom does a crappy job with them, Photoshop does OK
with them.
This was a 25 or so pixel shift stack that I think worked pretty well.
The reds blew a bit when I changed the profile to sRGB, in Prophoto they
are good.
http://users.accesscomm.ca/wrphoto/photos/index.html#/view/ID612608
You will take best advantage of pixel shift with images that are fully
in focus, which is why I do so many stacks, and where there is no
movement, though there is a motion correction setting that may help.
The green artifacting is weird, it appears to only be infecting the
blown areas.
The link below takes you to the first of three images.
Image 1: a regular K-1 DNG Image 2: a K-1 image with no changes to
settings etc. except that Pixel Shift was ON - image file stored as
DNG Image 3: the same image capture as in # 2, but this time I did an
in-camera processing of the file to create a TIFF file.
The linked images are a smallish crop of the original images.
http://photos.stanhalpin.com/p566717840/h80f3d918#h80f3d918
stan
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