camera evaluation brought up image processing/color space questions
camera evaluation brought up image processing/color space questions
- Subject: camera evaluation brought up image processing/color space questions
- From: David Remington <email@hidden>
- Date: Fri, 10 Nov 2000 11:08:14 -0500
Hello, Does anyone here have experience using the new Jenoptik Eyelike MF
Scan digital back? We just had one demonstrated in our studio and I am
would like some feedback on its software image processing. Specifically the
effect it has on the gamut of the capture. Even if no one has used this
camera, perhaps some of the resident color gurus have an opinion to share
on my observations. Photographing a kodak Q13 with no curves adjustment
(but a grey balance) reveals that the camera default is a 1.8 gamma curve.
This is the same as PhaseOne's default, although PhaseOne offers a 1.0
option if you truly desire raw data. This is not a problem as it is a good
starting point and in fact exactly what we desire for our archival master
images. What does raise an alarm is that captures opened in Photoshop in
Adobe RGB 1998 are grossly over saturated. ColorMatch is a much better
match. Am I correct in seeing this as an indication that the data has been
processed for a relatively small gamut color space? If so, is the capture
gamut of this device limited? Assuming an accurate camera profile is
created, could the capture data be safely transferred to a wider gamut
space? In my understanding you can't move data from a small gamut space to
a large gamut space and magically replace what might have been compressed.
Thanks in advance for any input.
David Remington