Anomaly in Merged Exposures of Water

Tamron SP 24-70mm f/2.8 Di VC USD Canon Mount

09/30/2012 07:13:05 PM · #1

I am noticing some anomalies in some of my recent HDR attempts when shooting a nearby stream. I am enclosing a full size crop of the issue.

These black spots are cropping up after merging three bracketed exposures in Photomatix pro for tonemapping.

Any thoughts on what they are and why this happens and what the fix might be? I was getting a lot of purple fringing around the highlights in the water, but that was fixed through lens color corrections in LR4. This is something else. It is not showing up in each individual shot and it only seems to have occured in shots containing water.

Any help will be appreciated.

Mike

Canon EOS-5D Mark II

09/30/2012 07:14:31 PM · #2

clone them out or try to remove ghosting?

Sigma 12-24mm f/4.5-5.6 EX Aspherical DG HSM for Nikon

09/30/2012 07:16:10 PM · #3

I was doing some cloning but I was hoping for a smoother option. I did use the remove ghosting option.

bohemka

Nikon D700

09/30/2012 07:47:22 PM · #4

I would try it again with the remove ghosting off. Trying to remove ghosting of moving water is likely introducing errors.

Sirashley

Nikon D7200

Nikon AF-S Zoom-Nikkor 70-300mm f/4.5-5.6G IF-ED VR

09/30/2012 08:12:22 PM · #5

That looks to me like an issue of the water reflecting and not merging evenly in three exposures... Try taking your median shot raw file, kick it down -2 and save, then +2, and save. Then take those three images and merge and see if you get the same result.

smardaz

09/30/2012 08:22:57 PM · #6

mmmmm, definitely looks like langoliers to me.....

09/30/2012 08:57:26 PM · #7

Originally posted by smardaz:

mmmmm, definitely looks like langoliers to me.....

Gaaah! I was trying to step over those!