[thelist] slightly ot: color anomaly in digital pictures

[Scott Harman]

Movie "The Net" Sandra Bullock...

can you shoot against a matt while piece of paper in regular mode, then
again in macro without moving the camera (mount it on a mini ped)  do a
pixel by pixel comparison -
will tell you whether it's a dead pixel group on the ccd or dust inside the
lens (most likely)
because you're shifting the focal point in such a vast way, it should
highlight the problem.

If it's dust inside the housing, it will have to be sent back and cleaned
properly (easier for them to replace it and recon the unit)

I've had this a couple of times with broadcast lenses whether light airblown
dust makes it into the lens, and the vendor simply replaced it (looks bad
for them) mind u - was a £12000 lens!
----- Original Message ----- 
From: "Chris W. Parker" <cparker at swatgear.com>
To: <thelist at lists.evolt.org>
Sent: Tuesday, July 29, 2003 9:34 PM
Subject: RE: [thelist] slightly ot: color anomaly in digital pictures


Dave Nelson <mailto:dnelson at netbank.com>
    on Tuesday, July 29, 2003 1:02 PM said:

> Don't click on it if it looks like a Pi symbol :)

Does this have something to do with the MOVIE Pi? Never saw it.

> Is it a dot or a pixel?

Well... I'll try to do some ascii art.

* = rich/saturated blue/1px
x = slightly less rich/saturated blue/1px

  xx
  xx
xx**xx
xx**xx
  xx
  xx

The grayish one works like this:

* = dark gray/1px
x = lighter gray/1px

  xx
  xx
xx**xx
xx**xx
  xx
  xx

They appear at random.


> Sound like the camera lens may be dirty.

Not likely because it's very very small.



Chris.
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