Difficult technical question on ISO & light

oooops. I guess my bozo bin is full then.

"Gymmy Bob" wrote in message
...
Any decent digital camera has 12 bit depth or more.

The maximum range would then be 2^12-1 = 4095, not 255

"Michael A. Covington" wrote in message
...

One could say that the reason for this is the clipping, that is, at
400
ISO the streetlights were more luminous than RGB = 255,255,255 but
they
have been clipped to that value.

But I think this is NOT the reason because if it should be, then what
would be the explanation for the fact that EVERY picture I take in a
whatever dark environment ALWAYS contains at least 1 pixel at with
one
of the three components (R,G or B) at 255? It seems like there is an
algorithm which multiplies the information from the CCD until at
least
1
pixel of the image reaches the maximum value (255).

BUT THEN, if such a normalizing algorithm exists, again the photos in
case a. and b. should present the same luminosity ratio between the
streetlights and the walls of the houses, while it is not like this.

There is no normalizing algorithm. Rather, almost every picture is
going
to
have a pixel that runs outside the available range of numbers and is
clipped
at 255, simply because real-world subjects cover a tremendous brightness
range.

In article ,
says...
oooops. I guess my bozo bin is full then.

Another Gravity user surfaces!
--
http://www.pbase.com/bcbaird/

In article ,
says...
oooops. I guess my bozo bin is full then.

Another Gravity user surfaces!
--
http://www.pbase.com/bcbaird/