Datacolor User to User Support Group.

Hi,

I have made my first real profile using the 225 patch target and am really pleased with the 
results! The green cast I was getting with the canned profiles is gone. Fleshtones are just 
a tad on the warm side compared to the test print soft proof, but it's very close and 
certainly acceptable. 

Nevertheless, I am trying to understand what might be causing the extra warmth and 
wondered if it could have anything to do with the paper white square reading just slightly 
cyan. 

When I measure the square, L=95.10, a=(-1.16) and the  b=(-1.78). Could that slight bit 
of cyan be pushing things in a warm direction? Also, I noticed when calibrating my 
spectro and measuring the white tile using the measure tool that my "b" reading is more 
negative than the "a" reading. "A" is about (-0.74) and "b" is (-1.84). I also noticed that 
other users get similar results with b being more negative than a. Is that because the white 
tile is also slightly more negative in the b than the a? 

Don't mean to pester you guys with too many questions, but I really do want to understand 
grasp the process so as to optimize the profiles. Thanks again for your help.

John

That just means there's a little whitener in your paper. If you want a  
different neutrality in your profile, a slight slider adjustment will  
so that.

C. D. Tobie
WW Product Technology Mngr.
Digital Imaging & Home Theater
DataColor.com
CDTobie@...

On Nov 16, 2008, at 6:25 PM, "John Arnold" <john.arnold@...>  
wrote:

> Hi,
>
> I have made my first real profile using the 225 patch target and am  
> really pleased with the
> results! The green cast I was getting with the canned profiles is  
> gone. Fleshtones are just
> a tad on the warm side compared to the test print soft proof, but  
> it's very close and
> certainly acceptable.
>
> Nevertheless, I am trying to understand what might be causing the  
> extra warmth and
> wondered if it could have anything to do with the paper white square  
> reading just slightly
> cyan.
>
> When I measure the square, L=95.10, a=(-1.16) and the  b=(-1.78).  
> Could that slight bit
> of cyan be pushing things in a warm direction? Also, I noticed when  
> calibrating my
> spectro and measuring the white tile using the measure tool that my  
> "b" reading is more
> negative than the "a" reading. "A" is about (-0.74) and "b" is  
> (-1.84). I also noticed that
> other users get similar results with b being more negative than a.  
> Is that because the white
> tile is also slightly more negative in the b than the a?
>
> Don't mean to pester you guys with too many questions, but I really  
> do want to understand
> grasp the process so as to optimize the profiles. Thanks again for  
> your help.
>
> John
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

--- In colorvision_group@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
>
> That just means there's a little whitener in your paper. If you want a  
> different neutrality in your profile, a slight slider adjustment will  
> so that.
> 

Two questions. 1) Would the slight cyan cast in the paper white cause the profile to be a little 
warmer than neutral? 2) Would that reflect itself in the fleshtones as well or would a slight 
lack of neutrality in the paper white just affect the highlights?

John

It would potentially show in fleshtones.  But I would not assume that  
it's even non-neutral: often when people show me a gray ramp and tell  
me it has a cast, measuring it with the spectro shows it to actually  
be neutral.  Just not the neutral they want. <G>

C. D. Tobie
WW Product Technology Mngr.
Digital Imaging & Home Theater
DataColor.com
CDTobie@...

On Nov 16, 2008, at 10:20 PM, "John Arnold"  
<john.arnold@...> wrote:

> --- In colorvision_group@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
>>
>> That just means there's a little whitener in your paper. If you  
>> want a
>> different neutrality in your profile, a slight slider adjustment will
>> so that.
>>
>
> Two questions. 1) Would the slight cyan cast in the paper white  
> cause the profile to be a little
> warmer than neutral? 2) Would that reflect itself in the fleshtones  
> as well or would a slight
> lack of neutrality in the paper white just affect the highlights?
>
> John
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

--- In colorvision_group@yahoogroups.com, Cdtobie <CDTobie@...> wrote:
>
> It would potentially show in fleshtones.  But I would not assume that  
> it's even non-neutral: often when people show me a gray ramp and tell  
> me it has a cast, measuring it with the spectro shows it to actually  
> be neutral.  Just not the neutral they want. <G>

I'll buy that. Actually the neutrals on the test print do look right. But I haven't measured with 
a spectro. I'll print a gray ramp and confirm that. So if the neutrals check out as neutral, then 
what else could be warming up the fleshtones and what would be the best way to adjust for 
that, especially if the rest of the print and the other colors look right? Would that be an area 
where the Expert target would come in handy by maybe providing more squares to sample? I 
know our brains are a lot more sensitive to fleshtones than a lot of other colors where we 
don't have such an engrained reference. I was thinking that maybe using the larger target 
might help.  What would you suggest?

John