L-39 print standard

[PUNEETRAZDAN]

What are the details of L-39 print standards.

[toronar]

Originally Posted by PUNEETRAZDAN

What are the details of L-39 print standards.

I don't know a print standard named L-39, but then again I am not an expert in this field.
But maybe you mean ISO 12647-2 and FOGRA 39L?
If you search for these terms you should find a lot of information about that standard.

[TerryWyse]

I'm assuming, like the other poster, that you mean "Fogra 39L". (the "L" simply means "Large Chart" or the ECI2002 chart (~1500 patches) as apposed to the smaller IT8.7/3 chart (~900 patches).

Fogra 39 and GRACoL2006 Coated1 are very similar datasets (GRACoL was derived from Fogra 39). They both represent a characterization data set for "premium" commercial sheetfed offset on Paper Types 1&2 (gloss/matte coated). If you're a commercial sheetfed printer, this is generally the characterization data set and ICC profile that you should be targeting. Here in the USA, GRACoL Coated1 is one of a family of "G7" datasets/profiles. The others (as of now) are SWOP Coated3 and SWOP Coated5. Since they are all part of the "G7" press calibration methodology, they all have similar visual printing characteristics but on different paper stocks.

Now if "L-39" means something completely different to you, then forget I said anything

Hope this helps.

Regards,
Terry

[PUNEETRAZDAN]

Thanks for replying,
Yes it is the same Fogra-39L. What i need is the Procedure to implement this standard on both sheet fed on which our cover page will be printed & web on which our inner form will be printed. i would also like to have the complete standards info like, Lab , dotgain,etc...Any test chart ???

[rich apollo]

You can download the dataset from Fogra Forschungsgesellschaft Druck e.V.. You can download an ICC profile from www.eci.org - download the ECI_Offset_2007 package. FOGRA 39L is an implementation of ISO 12647-2, although certain colors are out of spec. You can purchase a copy of the standard from ISO - International Organization for Standardization.

You could also perform a G7 calibration to come very, very close to the standard. You can get the information for that procedure from IDEAlliance.

FOGRA39L will, most likely, not apply to your web presses.

[TerryWyse]

Originally Posted by PUNEETRAZDAN

Thanks for replying,
Yes it is the same Fogra-39L. What i need is the Procedure to implement this standard on both sheet fed on which our cover page will be printed & web on which our inner form will be printed. i would also like to have the complete standards info like, Lab , dotgain,etc...Any test chart ???

It really depends on HOW you want to implement this "standard". Frankly, the easiest and "best" way from a press-to-proof matching standpoint would be to implement device link profiles (profile your press and "link" this to the Fogra 39 profile..use this to convert your jobs before they go to plate). Other ways, in order of their "effectiveness" would be...a slightly modified G7 approach, or use dot gain curves/plate curves.

As far as "test chart", I'm not quite sure I understand what you're asking. The test chart used for the 39L data was the ECI2002 (or maybe the IT8.7/4, can't remember). In any case, if you're talking about profiling your press, there's really no special requirement as to what profile test chart you use. I would suggest as long as it uses about 1,000 patches or more, you're good to go. About the only time the "test chart" matters is if you're interested in directly comparing the measurement data from your press to the standard data set. Even then, there's ways around this if you happen to use a different chart on press. Understand that if you're going to apply a "plate curve" method such as G7 or TVI (dot gain), there are charts specific to those methods that are not the typical ICC profiling test chart.

As far as the other info (Lab, dot gain...), you'll find most all of that in the ISO 12647-2 documentation. If you don't want to purchase that document (it's not free), you can download the (free) characterization data set for Fogra 39L and from that you can pretty much figure out the Lab values for solids, overprints, etc....you just have to know where to look in the data set. Since both "G7" GRACoL Coated1 data and Forgra 39L Lab data are *nearly* the same, you could also download the IDEAlliance G7 "How To" documentation. In there you'll find the Lab data for solids/overprints.

Feel free to contact me off-list if you'd like more info.

Regards,
Terry