Yes, you are right. Type 1 and Type 2 are treated as similar today.
Unless it is a very rough and thin coating, there should be no major problem to reach the desired results. What you mainly miss on a non-glossy substrate are the really dark shades at the bottom of the gamut. Where you may be reaching for much above 300% ink coverage.
 
 
Setting and drying is slower on matt than on gloss, so you need a longer time before finishing/binding. But it is nowhere close to the long drying times on uncoated.
 
Target densities on wet ink should be comparable on gloss and matt/silk.
 
The CIELAB coordinates on the final product is of course the dry product. This goes as well for the paper shade, after the paper has been through both press and bindery.
 
/petter
 
ps - there is some information related to target densities and resulting LAB-coordinates in my presentation on SlideShare: http://www.slideshare.net/petterkol/iarigai-2009-printing-by-the-numbers
 
 


 
On 24 February 2010 14:10, Juris Valdmanis <bebris@jt.lv> wrote:
Hello dear list members.

First of all I would like to thank everyone who helped me last time I asked my questions! Your help was valuable!
But now I have more questions regarding printing to ISO.

In ISO documentation there are Lab target values for primary and secondary colors for different paper types.
As we are sheet-fed printers we are interested only in paper type 1(gloss coated), type 2 (matt coated) and type 4 (uncoated white).
As I understood from documentation (I have only an old english version of ISO 12647-2 and english is not my native language as you may already realized) all papers what we use for printing I have sorted in these three types of paper.

But from documentation papers type 1 and type 2 have the same Lab target values for primary and secondary colors. >From my previous conclusion papers like fine gloss (with 3 coating layers) and rough matt (with only one coating layer) have same Lab target values.
No problems with type 1 (gloss) papers, as we can get very close to target values and densities are ordinary.
But for mate papers (type 2) we have to rise densities to get acceptable Lab values. It could be understandable as paper surface is rougher and you have to apply more color to get same saturate colors as on paper type 1.
Problem is that higher densities however lead to different problems in postpress as paper is not drying well and it smears.

Did I understood correct ISO documentation or am I missing something?

And also I did not find answer to another question: Are Lab target values for wet or dry colors?

Thank you, everyone.

regards,
bebris
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