Re: calculating from abscol to relcol from L*a*b*
Re: calculating from abscol to relcol from L*a*b*
- Subject: Re: calculating from abscol to relcol from L*a*b*
- From: Terence Wyse <email@hidden>
- Date: Tue, 21 Apr 2009 07:55:21 -0400
On Apr 21, 2009, at 6:37 AM, tl wrote:
So Terry, Please tell us what you really want to do, rather than ask
for the
formula to do it.
Thanks Tom for responding.
All I really want to do is to be able to take a typical text
measurement file of a testchart and convert the "absolute" L*a*b*
values to relative values in a way that would mimic a absolute-to-
relative "ICC" conversion. Just imagine taking a list of L*a*b*
measurements (where I know which patch represents the substrate
L*a*b*) and transforming them to relative values in a way not unlike
taking absolute/relative density measurements from a press sheet only
I want the relative conversion to duplicate what would take place in a
absolute/relative ICC conversion if I had an ICC profile made from
this same dataset.
I have a method currently that "works" but I'm getting deltas that
average in the .30-.50 range with maximum deltas in the 2.0-3.0 range
compared to a true relative ICC conversion. A colleague of mine has
graciously given me a spreadsheet that will do what I need but it
involves the cumbersome step of taking the absolute L*a*b*
measurements into and out of XYZ to get the relative L*a*b* values.
Regards,
Terry
______________________________
Terence Wyse, WyseConsul
Color Management Consulting
G7 Certified Expert
_______________________________________________
Do not post admin requests to the list. They will be ignored.
Colorsync-users mailing list (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden