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Is this blooming?
Old 12-26-2005, 04:13 PM   #1 (permalink)
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Just noticed this oddity with my D200. Bear in mind this is my first digital, so I may just be discovering things that you digital veterans have known about and dealt with for a long time.

It seems to occur on the left hand side of any overexposed area where the color sharply contrasts with the background. Like white on black. Hopefully this is visible enough.

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Re: Is this blooming?
Old 12-26-2005, 05:43 PM   #2 (permalink)
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Did you notice it in the large file and/or compressed version?

More information about blooming can be looked at here

http://www.dpreview.com/learn/?/Glos...looming_01.htm
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Re: Is this blooming?
Old 12-26-2005, 06:00 PM   #3 (permalink)
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Boy, maybe it's my ignorance but if I had to guess I would say that is a reflection. That link just happened to be at the right place at the wrong time. Am I way off?
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Re: Is this blooming?
Old 12-26-2005, 06:24 PM   #4 (permalink)
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I also thinks it's just normal reflection.

Ron
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Re: Is this blooming?
Old 12-27-2005, 06:37 PM   #5 (permalink)
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What lens are you using?
Chip
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Re: Is this blooming?
Old 12-29-2005, 04:56 PM   #6 (permalink)
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For anybody who's looking at this, I noticed a nice example of this on an image I took yesterday.




(This was shot from about 20 feet away with a nikon 200mm 2.8 ED lens and a D100 using an alien bee 800.)
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Re: Is this blooming?
Old 12-29-2005, 06:28 PM   #7 (permalink)
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Ok, I'm going to show my ignorance here. [img]/ubbthreads/images/graemlins/confused.gif[/img]
Are you saying that Blooming is the reflection made by the flash or strobe? Otherwise known as catch lights.
Please splain Lucy. [img]/ubbthreads/images/graemlins/crazy.gif[/img]
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Re: Is this blooming?
Old 12-29-2005, 08:02 PM   #8 (permalink)
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I'll say it like this, and somebody correct me if I'm wrong...

When a photosensor on a digital camera gets to the point that it is completely exposed, it cant expose any more. What happens is that "energy" that is on that single photosensor bleeds over onto a nearby photosenser(pixel). What happened in that picture I posted is that the reflection of the flash was the most exposed point in that image, so exposed in fact (at that small point) that it is really overexposed. So much so that the surrounding pixels are exposed a little extra. When you see that somewhere where a very dark border meets a very light border (like where the white reflection meets the black pupil) you get blooming. What is seen here is an increase of "purple fringing" due to that bleeding over of energy.

Why? Physics of light. different wavelengths of light refract (or bend) at different angles when they pass through a medium, in this case a piece of glass acting as the lens of the camera. Because some bend a bit more or less than the others you can see that they did not hit the exact same place on the pixel.

Think PINK FLOYD:



see, white light comes in, but the separate colors of white light (the color spectrum) separate when they goes through the glass.
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Re: Is this blooming?
Old 12-29-2005, 08:30 PM   #9 (permalink)
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OOHH OK, now that made it clear as mud on a rainy day [img]/ubbthreads/images/graemlins/confused.gif[/img]
Just kidding, I see what your getting at. same experience as a mushroom cloud sort of speak. The light has to go somewhere when the sensor is over exposed.
Thanks,
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Re: Is this blooming?
Old 12-30-2005, 02:04 PM   #10 (permalink)
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[ QUOTE ]
What lens are you using?
Chip

[/ QUOTE ]

I'm using the Tamron 28-75 XR Di f/2.8 jobbie. Unfortunantly I don't have another lens to test with or I would. Been wanting to pick up a standard 50mm Nikon lens, but my budget is a little tapped out right now.

I'm not really sure if it's even anything to worry about. The ultimate end result of my pics is typically print, and it may not even show up there. This has just been in my experimentation, and I can probably minimize it with accurate exposure.
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