2019년 3월 5일 (화) 오후 10:34, Benjamin Meyer <b.meyer@xxxxxxxxx>님이 작성:
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
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?