Hi Benjamin and all colleagues,
Here, for scanning process, we must take in mind reflection between gloss
target and scanning glass. I've never saw fine MRC coated glass in flatbed
scanners, though it's easy to change original glass with something like
ArtGlass UV 70 with more than 99% transmission. I plan to do it with my Epson
V550, and I'll write on results here.
With regards,
Aleksei Korobov
Вторник, 5 марта 2019, 18:34 +05:00 от Benjamin Meyer <b.meyer@xxxxxxxxx>:
Hi all,
I am using scanin and colprof to generate an ICC profile out of an IT8 target
from Wolf Faust. The observation I have made is, that this IT8 target (the
same image used for scanin) is way to bright when using the generated ICC
profile. I would expect that it would more or less reach the reference values
of the reference file. But the result is, that the raw image of the IT8 target
is much closer to the reference values than the image viewed under ICC input
profile condition. This looks quite strange to me.
Example:
The GS1 field of my IT8 target has a RGB value of (213, 210, 206), which is
something like (62.66, 64.75, 51.26) in XYZ.
The reference file for my IT8 target states (67.73, 70.48, 57.94) in XYZ for
GS1, assuming D50 light. In sRGB this should be (218, 219, 218).
Using the generated ICC input profile the same image is too bright. I measured
a mean value of (87.03, 89.95, 73.39). When converting to sRGB via collink I
get values of (245, 243, 242), which correspond to the XYZ values.
Is there an explanation for my observations?
Best regards,
Benjamin Meyer
