This would principally be a matter for your scanner software and especially the
channel / white balance and / or target white point. Exposure is also going to
be a factor.
In general, histograms are only good for very rough evaluation of the color and
tonality fidelity of an image capture workflow. It is, indeed, possible that
the results you're getting now are colorimetrically correct.
The simplest and easiest and quickest way for you to judge the quality of your
workflow would be to scan a ColorChecker and compare the recorded values
against those expected. If you're getting single-digit (or lower) DE errors for
all patches, call it a day. If not...if not, the nature of the errors will
point you in the direction of what to focus on next.
On Jul 4, 2016, at 7:58 AM, posts@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
currently I am experimenting with Argyll and get god results for my
Kodachrome target with shaper+matrix. However, one thing puzzles me. The
histograms with no ICC-profile applied more or less fill the available range
(see attachment 1). However, if I apply the ICC-profile, especially in the
red channel, the histograms are shifted towards lower values with a pile-up
at the lower end (see attachment 2). Where does this come from and how can I