In article , Peter A. Collin
writes
BJ Conner wrote:
I am asking this here because I know some of you are very knowledgeable
on the subject. I want to take digital photos of black and white
drawings with red and green pencil markups. The reds and greens are
not bright.
So far I can get the resolution I need but the reds and greens don't
show up so great. I think the problem is in the spectrum of the light
i am using. I have tried the flash on the camera, fluorescent
lighting, and sunlight.
I am going to build a stand to position the camera over the drawing (or
part of it). I will add lighting fixtures to the stand to get the
quantity of light but the quality of the light. I can get what ever
will work (metal halide, Ott lights, quartz etc.)
If you can suggest a better group I'll take it there, I found about 900
hundred photography groups.
Any way this has noting to do with who Cheny shot or Lie, Spin and
Deny.

I know thqt with a film camera I would try a trick called "reciprocity
failure". Basically, you use a slow shutter speed and a tight
aperture. The film is exposed for so long that the colors shift in a
very interesting way. Don't know if there is a digital analogy to that.

Peter Collin

No Reciprocity with digital, but I would suggest adjusting the white
balance in the camera in case the ambient light is negating the green
element in the subject.

If you can take the picture outdoors in sunlight, try a polarising
filter to increase saturation.
--
Bill Grey
http://www.billboy.co.uk