Paper white.
Paper white.
- Subject: Paper white.
- From: "Michael Lithgow" <email@hidden>
- Date: Mon, 4 Feb 2002 11:04:44 +1100
I recently made 2 RGB profiles for Epson Premium Gloss Photo Paper, one for
a 1270 printer and one for a 1290. The prints made with these profiles had a
slight blue fog appearance throughout. On investigation I found that the
measured paper white of the calibration target patches had a Lab value of L
93 a -1 b-3, giving a visually blue appearance which did not match the
actual paper white. By altering the data in the patch text file for the
white patch to numbers which provided a better visual match and rebuilding
the profiles I was able to achieve a much better end result. I use a
Spectrocam UV and Profiler Pro and the monitor is calibrated using Optical.
I am aware of all the discussion on the list concerning optical brighteners
and whether to UV or not to UV and I have to say that paper whites have
looked a better match since converting from the standard Spectrocam to the
UV model, though clearly there is still room for improvement in this
department.
How do other list users cope with this problem and in fact do others have
the same problem?
It would seem that having a spectrophotometer to give highly accurate
readings and then at the end of the day having to use trial and error is
somewhat self defeating.
I would also be interested to know what Lab readings other list subscribers
were getting for the paper white on this Epson Premium Gloss paper and on
what measuring devices and whether or not the readings were UV filtered.
Michael Lithgow
Michael Lithgow Photography & Laboratory
177 East Boundary Road
East Bentleigh
Victoria 3165
Australia
Ph./Fax 61 3 95794088