Digital BW, The Print

Hi Havanai:

Weight and thickness are two separate items. Think about a piece of  
foam vs. a piece of steel-they can be the same thickness but a very  
different weight. Some papers are more dense than others. You can get  
a sense of the mil vs. gsm by checking the specs of a few papers that  
you are familiar with.

For example, many semi-gloss papers are similar to Epson's Ultra  
Premium Photo Paper Luster, and a search on Amazon.com will lead to  
these specs:
# 240 g/m2 weight
# 10 mil thickness, 97% opacity

Atlex.com has gsm and thickness listings on many of its papers.

You can convert mm (millimeters) to mil since those are both thickness  
units. 1 mil is 1/1000 of an inch, and 1 mil = 0.0254 millimeters.

Hope that helps.

All the best,

Andrew
---------------------------------------------------
Andrew Darlow
Editor, The Imaging Buffet
http://www.imagingbuffet.com
Author, 301 Inkjet Tips and Techniques:
An Essential Printing Resource for Photographers - http://www.inkjettips.com


On Jan 7, 2010, at 9:11 AM, Havanai wrote:

> Is there a mathematical relationship between a paper's Weight,  
> expressed in GSM (grams per square meter?) and Thickness, expressed  
> in Mil?
>
>
> __._,





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