Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
03-22-2013, 02:04 PM   #1
Senior Member
tdmsu's Avatar

Join Date: Nov 2007
Location: Michigan
Photos: Gallery
Posts: 131
Strange HDR artifact

While shooting the Spirit of Detroit today, I decided to try out the HDR function, and it seems to have amplified the chromatic aberration (if that's what the purple is) as well as the rest of the image. It's strange to me because it was not a sunny day, and I was facing east in the early afternoon. I like the way the gold pops, and I kind of like the purple, too because is appears to be peaking between the statue's fingers.

What do you think?

Attached Images
View Picture EXIF
PENTAX K-01  Photo 

Last edited by tdmsu; 03-22-2013 at 02:33 PM.
03-22-2013, 02:20 PM   #2
Veteran Member
joe.penn's Avatar

Join Date: Mar 2011
Location: Maryland (Right Outside Washington DC)
Photos: Gallery | Albums
Posts: 2,902
QuoteOriginally posted by tdmsu Quote
What do you think?
Post the pic...
03-22-2013, 02:43 PM   #3
Senior Member
tdmsu's Avatar

Join Date: Nov 2007
Location: Michigan
Photos: Gallery
Posts: 131
Original Poster
Internet hiccup - thanks for the snark, though.
03-22-2013, 02:53 PM - 1 Like   #4
Pentaxian
panoguy's Avatar

Join Date: Sep 2007
Location: Washington, D.C.
Photos: Gallery | Albums
Posts: 3,281
That's just the Spirit of Detroit made visible! Looks pretty good, even if unintentional...

03-22-2013, 03:27 PM - 1 Like   #5
Ole
Administrator
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
Photos: Gallery | Albums
Posts: 3,785
Light from behind you hitting the gold, then reflecting through the fingers. Diffraction caused by the small opening between the fingers smears the effect.

Perhaps there also is a reflection from the sensor back to the lens's rear element and then back onto the sensor again. Hard to say.
03-22-2013, 03:40 PM   #6
Veteran Member
Anvh's Avatar

Join Date: Sep 2011
Posts: 4,616
looks like ghosting, i believe the sun was in the trees or not?
03-23-2013, 05:38 AM   #7
Veteran Member
ChrisJ's Avatar

Join Date: Nov 2008
Location: Eckington, Derbyshire UK
Photos: Gallery | Albums
Posts: 316
Did you have a 'protection filter on? If so remove it and the effect will disappear or at least reduce.

Flare is caused by bright highlights internally reflecting within the lens, in this case probably originating from the bright gold statue. Normally these reflections bounce out of the lens and away, but the flat surface of a filter acts like a screen and reflects them strait back into the lens again (and again, and again) recording onto the sensor every time which makes any flare much more pronounced.

The clue is in the colour of the flare, blue is the reciprocal of yellow, which would be the original colour of the highlight if it came from the gold statue. The HDR processing would exaggerate this.

Chris

Last edited by ChrisJ; 03-23-2013 at 05:44 AM.
03-23-2013, 07:02 AM   #8
Senior Member
tdmsu's Avatar

Join Date: Nov 2007
Location: Michigan
Photos: Gallery
Posts: 131
Original Poster
I did not have a filter on the lens, but light reflecting sounds good. The same artifact appears on another HDR of the same statue, so now I'm wondering more. I'll attach two photos from the same day, both HDR. One has the purple artifact, the other is a wider shot to show the weather conditions, and I don't see the purple on that one.

I have not noticed this artifact on non HDR shots, or on other subjects...

Attached Images
View Picture EXIF
PENTAX K-01  Photo   
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
hdr, k-01, k01, mirrorless, pentax k-01
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
K5 HDR Artifact stoge Pentax K-5 3 07-11-2011 03:24 AM
Black & White Ape skull - museum artifact Gareth Post Your Photos! 13 06-15-2011 01:06 PM
Help with processing artifact: Rodinal/stand dev Todd Adamson Film Processing, Scanning, and Darkroom 13 04-11-2011 12:52 AM
Image artifact madphys Pentax DSLR Discussion 20 01-03-2009 08:03 PM
artifact correction via photoshop gpaual Digital Processing, Software, and Printing 2 01-07-2008 08:44 PM



All times are GMT -7. The time now is 05:55 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top