#1  
Old 20-06-2010, 06:41 AM
rcheshire's Avatar
rcheshire (Rowland)
Registered User

rcheshire is offline
 
Join Date: Apr 2010
Location: Geelong
Posts: 2,617
Mystery artifact

Is that a bug crawling over the lens?

Perhaps, posting during the wee hours is not a good idea. But that's the down side of having a shift worker in the house.

I can't be sure what caused this line through the image. It was taken some time ago with a very poor quality lens - the ghosting is quite apparent. The only reason I kept it was because of this artifact. I've inverted the image to increase the contrast, but what might be the cause? It appears to be a trace of light and only guess it's origin?

Closer examination shows the trace originating in the bottom right of the frame and then it seems to increase in intensity at the top of the image followed by a short diminishing spiral and the trace stops.
Attached Thumbnails
Click for full-size image (pfs_pregamma_1_mantiuk_contrast_mapping_0.1_saturation_factor_0.8_detail_factor_1.jpg)
94.1 KB65 views

Last edited by rcheshire; 21-06-2010 at 07:07 AM.
Reply With Quote
  #2  
Old 21-06-2010, 12:58 PM
michaellxv's Avatar
michaellxv (Michael)
Registered User

michaellxv is offline
 
Join Date: Oct 2009
Location: Adelaide, Australia
Posts: 1,581
A stray fibre of some sort?
Reply With Quote
  #3  
Old 21-06-2010, 06:13 PM
bmitchell82's Avatar
bmitchell82 (Brendan)
Newtonian power! Love it!

bmitchell82 is offline
 
Join Date: Jul 2008
Location: Mandurah
Posts: 2,597
yep thats about it,

Thats why flat field calibration images are so important. to map optical defects. namely vingetting and dustmotes and other misc humanly gunk
Reply With Quote
  #4  
Old 21-06-2010, 06:23 PM
rcheshire's Avatar
rcheshire (Rowland)
Registered User

rcheshire is offline
 
Join Date: Apr 2010
Location: Geelong
Posts: 2,617
Thanks!
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 03:01 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement