Datacolor User to User Support Group.

Sorry, I hate it when people ask questions and don't give enough info to
answer them.

 

I'm using an Epson 2200 with MIS Pro color inks on Premier Fine Art 270
paper. I know I had previously asked a question about mottling on this
paper. That now seems to be the result of bad (or mis-labelled) batch of the
paper. I have had no problems with making a color profile for this paper
with my recent box. The problem I'm having now is with achieving neutral
grays in the highlights with the profile I created with the Extended Grays
target. I've included a plot of my measurements of a 21 step wedge (although
I'm not sure Yahoo will let me post it to the list). From the chart you can
see that the a* and b* are more or less within 1 point of neutral (right Y
axis) down to about 40%K and then start to separate. Visually, the steps
from 30% down to 5% are the most noticeably pinkish blue.

 

A similar plot using the profile made without the extended grays shows a
wider variation of a*and b* from neutral and thus the benefit of using the
extended grays. However, the extended grays profile does not have as linear
plot of L*

 

Tom Moore

 



 

 

  _____  

From: colorvision_group@yahoogroups.com
[mailto:colorvision_group@yahoogroups.com] On Behalf Of CDTobie@...
Sent: Monday, February 04, 2008 11:58 AM
To: colorvision_group@yahoogroups.com
Subject: Re: [colorvision_group] Problem printing neutral B&W

 


In a message dated 2/1/08 1:01:12 AM, rtmlists8888@... writes:





So my question is: has anyone made a profile that has been able to produce
good neutral black and white images?



Many. On a good printer/paper/ink combination, the entire ramp is less than
one a*/b* point from zero. Since you never mention what printer, inks, or
media you are using, its difficult to respond with suggestions.