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| Blue Halo http://paulcbuff-techforum.com/viewtopic.php?f=8&t=411 |
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| Author: | ScottFX [ Thu Mar 25, 2010 11:41 am ] |
| Post subject: | Blue Halo |
Paper: Brand: Savage Color: Artic White Camera: D300 Lens: 28-70mm f/2.8 Background lights: White Lightning x1600 with 7" reflector, flagged with wood bifold panels Mainlight: Alien Bee b800 through a 4ft octobox On the floor was a generic white tileboard. I color corrected using a Photovision white, grey, black fold out thing. So those are all the details, why is there blue around her head?!?!?! 
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| Author: | ScottFX [ Thu Mar 25, 2010 11:45 am ] |
| Post subject: | Re: Blue Halo |
Nevermind, I found the answer.... Quote: The arctic white has the blue in it so that it looks like white in the arctic where the blue sky tinges all the white with a very cool caste. When used for that purpose it is excellent. They also make white and bright white. I prefer bright white, but white is not bad either. The blue in arctic is there for a reason, but most sales people don't tell you.
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| Author: | Technical Support [ Thu Mar 25, 2010 11:53 am ] |
| Post subject: | Re: Blue Halo |
looks like CA, or chromatic abberations. This frequently happens in a high contrast situation, dark subject on a light background. Different wave lentghs of light (different colors of light, all of which are contained in white light) bend through matter at different rates. At this sharply contrasting edge, the blue is straying from the rest of the colors a little, and appears as a blue halo. Other colors can appear, too. (purple or magenta are most common, though I would suspect different WB settings can change one color to another). This is an optical function of a lens, and not necessarily an indicator of a bad lens, as all optics are prone to some type of abberation. A better explaination:http://en.wikipedia.org/wiki/Chromatic_aberration |
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