Black backing, white backing???

[BeauchampT]

Thank you for all your inputs. That gives me something to work with quite well.

And I agree that unless we have to prove compliance there is no real necessity to go overboard. Helpful advice from one and all.

[BeauchampT]

Actually, one more question.

I have found basic references in ISO, FOGRA, and other documents for the black backing target values, or how to transform the white backing targets to black backing. However, there does not seem to be a comprehensive list for each paper type.

Could anyone point me in the direction of an organization who has taken the time to come up with an icc profile (or at least list of target values) for black backing measurements based on the ISO 12647 standard?

[lyzan]

just in case, target values for white backing are different from black backing.

[rich apollo]

Actually, one more question.

I have found basic references in ISO, FOGRA, and other documents for the black backing target values, or how to transform the white backing targets to black backing. However, there does not seem to be a comprehensive list for each paper type.

Have you looked at the ISO 12647-2 documentation? It has a list of black and white reference values for 5 different paper types.

Any standard dataset, or profile, you pull up should be from measurements on white backing. You can double check by pulling the profile or dataset up in Excel, or a text editor. The header information should tell you how it was measured. Your target values are in there. Just sort the data. Or apply the profile to some color patches, in Photoshop, and convert to Lab.

[BeauchampT]

I had noticed the black and white references in the ISO 12647 document. However, the icc profile that we are using for our proofs is a ECI profile, PSO MFC (a paper type of improved newsprint that floats between the ISO paper types 3 and 4 I believe). Anyways, ECI provides only the white backing reference values, and nothing with black backing for quality control during print. Now I noticed some bvdm documents that show how to change the white backing values to black, but it only discusses with the ISO paper types (again, I am floating in between these), and only gives the adjustments for the process colours and overprint (CMYKRGB). I suppose I am really just looking for a way to calculate myself the black backing values from the white. Any thoughts?

[meddington]

I have an excel sheet that'll do the calculation for you. PM me if interested.

[peatoire]

The LAB measurements will be different between black and white backing (depending on the paper thickness). The key is to make sure the software that's analysing the measurements knows which one you are using.
(Sorry if this is stating the obvious)