On May 6, 6:29=A0am, "KC" <kc12...@[EMAIL PROTECTED]
> wrote:
> I usually try to set my exposure so that there will be a whitest white
and=
> blackest black, using the full range of illumination. =A0I use manual
mode=
a
> lot, and set ISO, aperature and shutter speed accordingly. =A0I have a
Can=
on
> S3.
>
> Occasionally, in below average lighting conditions, I can't adjust the
S3 =
to
> get a black black and white white. =A0I get shots which can have a white
w=
hite
> and blacks stop at gray, or a black black with whites that stop at gray.
>
> Is this normal and just the nature of certain exposures or is there
always=
a
> way to get a full range of lighting?
>
> SC
If the subjects brightness range is less than the dynamic range of the
sensor/film you will be able to get a black/black or a white/white but
not both without adjusting the levels in post processing. Draw a line
6 inches long on a sheet of paper and let that be the dynamic range of
your sensor. Label the left end B and the right end W. Draw a
shorter line, say 4 inches long, on another sheet of paper. If you
line up the left end of shorter line with the left end of the long
line, you can see that it falls short of the W, you won't get the
white, just a shade of light gray. Slide it the other way and you get
your white, but you now can see it falls short of black, giving you
another, dark gray. What you are effectively doing with the levels
control is making the long line fit the short one (shrinking the
dynamic range) so that you get the range from black to white. It
weren't no different with film, it was just handled differently in the
darkroom.
Vance
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