Datacolor User to User Support Group.

I kinda figured that it would get much more complex the further I
went. A little much for the average garage color scientist. any way I
figured out how to imput lab values directly into the xrite converter
so this saves a few steps. This will hold me for a while till
colorvision gets there own munsell converter in the new spot color add
on for printfix pro.:o)))

Thanks!

--- In colorvision_group@yahoogroups.com, CDTobie@... wrote:
>
> 
> In a message dated 2/27/07 2:34:08 PM, rlphoto@... writes:
> 
> 
> > Thanks CD, I managed to find on the web the lab values of all the
> > munsell chips from the RIT site. There are 6 vertical collums of data.
> > HVC XyY. Can I just copy and paste into excel? It would take me a year
> > to enter this data by hand.
> > 
> Sure, but you need to have certain Excel (and math) skills... and
the values 
> you have are XyY (or more likely xyY), which can be converted to Lab
from 
> there, but are not automatically in Lab. So you would need to create
an xyY (or 
> whatever) to Lab formula, drag it down to all rows, and it would
spit out three 
> more columns, of Lab values for each chip. My theory was that you
would just 
> measure your chips in order, and it would give them real, measured,
Lab values, 
> rather than theoretical, batch values.
> 
> And you aren't done there... you need to create a search function
that will 
> find the closest match in all three columns (Lab) for your input
value. Its 
> easy to search one column for the closest single value, but its more
complex to 
> search three of a calculated least difference. It would be simplest
to subtract 
> your values L, a, and b compents from each, and add the absolute
value of the 
> three results together, and search for the smallest total: but
calculating 
> the DeltaE94 for each from your input value, and finding the
smallest DeltaE94 
> would be the best method. Sorry you started this yet? <G>
> 
> C. David Tobie
> Product Technology Manager
> ColorVision Business Unit
> Datacolor Inc.
> CDTobie@...
> www.colorvision.com
> 
> 
> 
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