G7 Compliant Paper

[Skinflint]

Does anyone know of brands of paper that are G7 compliant?

[Bret Hesler]

The last one I knew of that was close was Lustro (LOE), but that is no longer being manufactured. There are a few that are on the outer edge, depending on which spectro is used to measure them (Sterling, Opus, Utopia)

Bret

[Skinflint]

Anyone else have suggestions on paper for G7 calibration?

[gordo]

The last one I knew of that was close was Lustro (LOE), but that is no longer being manufactured. There are a few that are on the outer edge, depending on which spectro is used to measure them (Sterling, Opus, Utopia)

Bret

Just be aware of the OBA (Optical Brightening Agents) content of the papers that you are considering since they can effect how your instruments read/misread your calibration forms.

best, gordon p

[Skinflint]

Just be aware of the OBA (Optical Brightening Agents) content of the papers that you are considering since they can effect how your instruments read/misread your calibration forms.

best, gordon p

Gordo,

Do you have any tips on how to locate the right substrate?
My thoughts were to use the stock we use most often as our house stock.

I'm not getting much help from paper merchants, they act like this is the first they have heard of G7. Do you know of any sources that can help me out?

[gordo]

Gordo,
Do you have any tips on how to locate the right substrate?
My thoughts were to use the stock we use most often as our house stock.
I'm not getting much help from paper merchants, they act like this is the first they have heard of G7. Do you know of any sources that can help me out?

Just a point of clarification, G7 is a method not a specification.
Paper mills and merchants use very different methods and metrics compared with what printers use. That being said, it's disappointing, given the interest and uptake of GRACoL 7/ISO 12647-2 that your paper supplier (probably like most paper suppliers) has not identified specific papers in their inventory that conform to the ISO specification.

I'm sure there are better ways, but in your case, I would ask for your paper supplier's swatch books so that you can measure the color of the paper yourself. For commercial printing your looking for a type 1 paper with as little fluorescence as possible and a nominal white point of 95 L* (+/- 3), 0 a* (+/- 2), -2 b* (+/- 2) (measured with non-fluorescing white backing).

You can get a qualitative idea of the amount of OBAs in the paper by viewing the samples under a cheap black light like this:
available for less than $10 at any shop that sell rock n' roll paraphernalia. You want the one that uses a fluorescent tube rather than an incandescent bulb.

While you're doing that, check the OBAs of your proofing paper relative to your press paper:

You're looking for a proofing paper that has similar OBA content with your press sheet.

hope this helps, gordon p

[Skinflint]

Just a point of clarification, G7 is a method not a specification.
Paper mills and merchants use very different methods and metrics compared with what printers use. That being said, it's disappointing, given the interest and uptake of GRACoL 7/ISO 12647-2 that your paper supplier (probably like most paper suppliers) has not identified specific papers in their inventory that conform to the ISO specification.

I'm sure there are better ways, but in your case, I would ask for your paper supplier's swatch books so that you can measure the color of the paper yourself. For commercial printing your looking for a type 1 paper with as little fluorescence as possible and a nominal white point of 95 L* (+/- 3), 0 a* (+/- 2), -2 b* (+/- 2) (measured with non-fluorescing white backing).

You can get a qualitative idea of the amount of OBAs in the paper by viewing the samples under a cheap black light like this:
available for less than $10 at any shop that sell rock n' roll paraphernalia. You want the one that uses a fluorescent tube rather than an incandescent bulb.

While you're doing that, check the OBAs of your proofing paper relative to your press paper:

You're looking for a proofing paper that has similar OBA content with your press sheet.

hope this helps, gordon p

Gordo,

Thank you very much for this information. You are a wonderful resource.

We are using EFI 2200 gloss proofing paper which falls in the LAB spec of the G7 "METHOD" (thanks for that clarification also).

[mglouis]

Very clever. Thanks Gordo!

[gordo]

Very clever. Thanks Gordo!

And when all else fails there's always: Getting Sign-Off

;-) best gordo

[randy williams]

hello,I am a paper merchant and after doing some investigating I do not believe that you will find g7 compliant papers. The reason is that the paper is such a variable that it would be next to impossible to find the same grade of paper everywhere in the world. My understanding is that is why you need to understand the values of the paper so you as the printer can make adjustments based on the previous paper so that the printed image will have the same appearanceon the paper you now want to use. Your paper merchant can get you the value specs you need and then you can make your adjustments as long as you know the specs of the paper you are trying to match. I hope this makes sense