Re: [Phys-L] Light Spot.

["John Clement" <clement@hal-pc.org>]

It looks exactly like what you get when there is a light leak in a camera,
or in a modern camera during a flash picture where you get bright spots due
to reflections from dust.  The spot washes out the background which means
that it is not being reflected from the ground, but is a more local
phenomenon.  Is this taken through a window?  If so it could be in the
window.  It is hard to see if there is any shadow around it.  Since it is
taken by a digital camera, the brightness may not represent the true
situation.  Digital cameras do all kinds of processing which distort the
picture.  I have found that they tend to turn scenes with slanting sunlight
and shadows into unrealistic pictures, while film cameras can capture the
effect.  Since the picture has been compressed, fine details have been lost.
We do know from the shadows that the sun is behind the camera, so it is
quite possible that the bright spot could be located at the plane's shadow.
Indeed there is no shadow anywhere else in the picture, so the bright spot
is likely at the shadow.  I tried refocusing the image to as to bring out
any shape in the spot.  It became a rather parabolic looking shape with the
open part partially down, but mainly to the left.  I used focus magic which
has a pretty good deconvolution routine.

Are there any other observations that might be helpful?

John M. Clement
Houston, TX

> -----Original Message-----
> From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of 
> Aburr@aol.com
> Sent: Monday, January 14, 2013 6:07 PM
> To: Phys-L@Phys-L.org
> Subject: Re: [Phys-L] Light Spot.
>
> But could it possibly be a Poisson bright spot?
> yes
>  
> Alex. F. Burr  
>
>  
> In a message dated 1/14/2013 4:08:52 P.M. Mountain Standard 
> Time, betwys1@sbcglobal.net writes:
>
> Here's a  picture of the light  spot
>
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