Stephen Scharf wrote:
............The photographer was shooting Shutter prority at 1/160th
of a second, and had set the camera to give -1 stop expsoure
compensation. This was most likely accidental.
Ah, I understand operater error, although I am never guilty of it. :-) :-)
If you leave the thumbwheel on the back of the 1D turned on (there is
a switch which turns it on and off, and Mike always leaves it on) and
turn it accidentally, or brush it against something, it can set the
exposure compensastion up or down by accident.
OK, ergonomics, not algorithms.
.......With the 1D, the exposure is usually spot on except for very
bright, afternoon sun (common conditions shooting racing in
California), where it tends to blow out highlight tones a little. In
this situation, We set up our cameras for -1/3 stop exposure
compensation.
I mostly hve my little 2mp S110 set at -1/3, as it seems to loose
highlights more easily than shadows. Of course, it has no histogram
display, so this is strictly from experience.
.......With respect to green cast, apparently, it only does this with
JPEGs and not RAW images.
All the following stuff aside, shouldn't color balance be the same with
processing to JPEG in the camera as in the computer?
Canon only indirectly acknowledges the camera does this with JPEGs.
They claim it is a white balance issue, and if you shoot a custom
white balance under your lighting conditions, you won't have it. As I
said earlier, they are very likely right, but the camera does have a
tendency to render this greenish cast when using Auto White balance
under some circumstances, but it is heavily dependent on lighting
conditions. Sometimes I see it, most times I don't. But it occurs
frequently enough that people complain about it on the Canon Forum at
Rob Galbraith and DPReview. As for a fix in firmware, if it varies
with lighting conditions, it seems that it might be tough for one
firmware setting to correct under all conditions.
I suppose the 1D is about due for replacement anway, so they can fix it
in the new one and brag about it! "IMPROVED WHITE BALANCE UNDER MOST
CONDITIONS!! NEW PROCESSING CHIP GIVES MORE ACCURATE COLOR IN JPEGS!! ETC!!"
You can program, in the custom functions area, alternative R/G/B
settings to correct this, at least for the most part.
Fine for many uses, but not much help for your work.
Thanks for the info,
Moose
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