Archived posting to the Leica Users Group, 2006/12/21

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Subject: [Leica] IMG: Another Comparison
From: mark at rabinergroup.com (Mark Rabiner)
Date: Thu Dec 21 10:27:39 2006

On 12/21/06 8:26 AM, "MARK DAVISON" <davison_m@msn.com> typed:

> Tina,
> 
> Incandescent light is particularly rich in infra-red.
> 
> Remember also that the part of the image due to infra-red light will not be
> in focus.  That might account for part of the blurring of the flame image.
> 
> I would bet that the flag in your picture was made out of synthetic fabric.
> Synthetics are notorious for their high IR reflectivity.
> 
> My opinion is that you cannot use the M8 to photograph indoor events in
> color which are lit by IR rich sources if there are synthetic fabrics
> present.
> 
> Please note that changing WB after the fact cannot fix the IR problems--the
> IR contamination shifts the colors of objects differently, depending on how
> much they reflect IR. Synthetic black goes to magenta.  Synthetic green 
> goes
> to gray, and so forth.
> 
> Mark Davison
> 
So some guy who got an A in Math cant come up with an algorithm for that
some night at 3 AM?
They figured out how to make the pixel grabbers bend in from the edges this
is just software?!?


Mark Rabiner
New York, NY
40?47'59.79"N   
73?57'32.37"W

http://rabinergroup.com/




In reply to: Message from davison_m at msn.com (MARK DAVISON) ([Leica] IMG: Another Comparison)