On 11-03-13 8:19 PM, Jeffery Johnson wrote:
I noticed in some of my photos that the blue of the sky is pixelated and
other times it is smooth. I am using the kit lens DA L 55-300 with a
polarizing filter. Could this be caused by the filter or something else
within the settings of my K-R. Any insight into this would be greatly
appreciated and I have not asked this before but are there any Pentaxians on
the list from Nashville.
Thanks,
Jeffery
___________________________________________________
Pictures that I have taken on Flickr:
http://www.flickr.com/photos/jt-johnson/
Checklist of things that may result in you seeing banding in areas of
smooth gradation:
* shooting JPEG (8-bit images)
* processing with 8-bit software *anywhere* in the workflow (eg ACR
set for 8-bits, PS Elements, Gimp, etc.)
* doing multiple destructive Levels or Curves operations (possible
even with a 16-bit editor)
* image is ultra "clean" (eg you shot it at ISO 100 and there's
absolutely no noise in the image)
* viewing image on a TN LCD monitor
Solutions:
* shoot RAW (12-16 bits)
* use only 16-bit modes throughout the workflow
* use non-destructive editing where possible (eg Lightroom, Smart
Filters in PS)
* minimize destructive edit passes
* intentionally introduce a little random luminance noise to the
image before conversion to JPEG (like fake film grain; can look
very nice if done right)
* view images on an IPS monitor
I haven't noticed banding caused by optical filters. Can't say if that
could be a problem myself.
Where other people view your image is rather out of your control. You
could put a perfect image online but someone viewing it on a crappy
laptop's TN screen could see banding and figure it's your fault. Either
ignore that possibility or use the random luminance noise trick to mask it.
-bmw
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