Thanks Greg,
These machine vision cameras have no readout and are driven from a GUI
via USB / Firewire. The GUI I'm using for this particular camera has
settings for:
Gamma .01 - 2.56 (which I set to 1)
Blue Gain 0-1023 (adjusted to get the on screen image as close to grey
for the particular light source under which I'm shooting)
Red Gain 0-1023
Brightness 160 - 842 ( adjusted to 160 ~I think this is the same as
CCD sensor gain and thus what I need to correlate to ASA)
Exposure .01ms - 3mins (I'm using this to bracket the images)
The lens I'm using has a manual iris for setting aperture. I'm
dividing the focal length of the lens by the diameter of the aperture
to derive the f/stop value.
I think I just need to experiment with setting the brightness value
to its lowest setting under a constant light source and see what kind
of values i get from the HDR shots using a constant ASA value in
HDRgen and adjusting this value until I get some agreement between
measured brightness and HDR image brightness. I'f I'm lucky a
brightness value setting of 160 will equal an ASA of 160:)
Thanks again for you help Greg. Also, thanks to those who replied to
my previous posts on color channel masking...great help!
Cheers,
Chris
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