Epson7000: Absorption/ReflectanceReadings
Epson7000: Absorption/ReflectanceReadings
- Subject: Epson7000: Absorption/ReflectanceReadings
- From: Mark Tucker <email@hidden>
- Date: Fri, 29 Dec 2000 07:21:42 -0600
- Organization: http://marktucker.com
I am attempting to tweak an ICC profile using an Epson 7000 using
Generations inks, and a coated watercolor sheet. I had Andrew do a
profile for me, and it's very "neutral" but it tends to moosh up in the
90/95/100% areas. I'm using CustomColorICC to tweak his profile. Several
questions have come up in this process:
1. Even though this sheet is coated, is there a possibility that the
inks would absorb "more" in these more saturated areas? I built a curve
to try to alter this and it's worked pretty well. I tried to isolate
only the 90-100 areas.
2. Why do profiles have both a name and a description? It seems that
sometimes a profile is known by one or the other in a pull-down menu.
What's the purpose in this two-pronged approach? It seems only to risk
confusing matters.
3. I also added Digital Swatchbook to the mix this week. After setting
it up and calibrating it, I notice that even though my 100% black chip
in the 21-step wedge LOOKS totally black, the reading from the
spectrophometer reads out at about 31/32/35 RGB. I would think it would
be definitely 0/0/0, because the black is so saturated. Just to check,
we read also a glossy stock with a black chip, and also got about
30/30/30 value in the black. This seems to devalue all the other reading
that we got along the wedge, although the upper values seem to coincide
more with the RGB value from the InfoPallette. The problem seems to
start when you get darker than about 80-85%. I tried to find a way to
manually "force" my blackest black to a "0/0/0 reading" but could not
find a way.
Any insight on these three issues would be appreciated. Thanks in advance.
Mark Tucker, Commercial Photographer
http://marktucker.com