Re: Epson Metamerism
Re: Epson Metamerism
- Subject: Re: Epson Metamerism
- From: Graeme Gill <email@hidden>
- Date: Mon, 20 Jan 2003 11:39:56 +1100
Pete Carter wrote:
>
Whilst profiling a 2000p the other day it got me wondering how people can
>
cope with the huge colour shift on these pigment inks when moving from one
>
light source to another.
This happens to one degree or another with any ink set, since a
known illuminant is a pre-condition for tri-stimulus color matching.
Some people have reported dramatic difference between Epson Dye and
Pigment inks, but we've seen this effect to a similar degree
with both types of ink.
Possible ways of improving the result:
Use a profiling package that lets you specify the spectrum
of the light source you will actually be viewing under.
Use more black in the profile. 100% UCR will minimize the
the effect the most, at the cost of visible black dots.
>
Does anyone know what artificial light source displays as good as daylight
>
for these inks (my 5000K lightbooth sure doesn9t)?
Solux seems to be about the best bet for a light source spectrally similar
to D50 at the moment.
>
When measuring with a spectro, actually how accurate is the measurement
>
compared to conventional inks as artificial light is thrown on the patches
>
by the spectro so it can be measured?
The measurement is perfectly accurate within the scope of what it
does. The spectro divides out its own light source in
measuring the reflectivity of the sample. The only way the
characteristic of the light source the instrument uses will
affect the result to any significant degree, is if there
is fluorescence in the sample.
Graeme Gill.
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.