Re: [ATM] How dark is dark?

["Jerry Reddell" <jerry.p.reddell63@sbcglobal.net>]

In the original post, the densitometer measurements were of  "emulsions"
used in photography.    Further the levels mentioned indicated extreme
(huge) differences in the reflection.  If I understand his message, the
reflection of matte was twice the reflection of the Glossy. .. I am not sure
what the light bandwidth used in the measurement or the accuracy of the item
or how repeatable the measurements are.

Reflections data I have seen on Black Glossy paint is on the order of 8%.
Flat paint being in the same order. (I suspect differences exist on the
brand of paint etc.)  At any rate, if black glossy paint has a reflection of
8%, then the densitometer measurement data would imply matte paint to have a
reflection of  16% or so... some light colors (off-white) of paint reflect
less than that....

I am skeptical.

Jerry P. Reddell


-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net]On Behalf
Of hermit
Sent: Tuesday, September 26, 2006 3:35 PM
Cc: ATM List
Subject: Re: [ATM] How dark is dark?


Jerry Reddell wrote:
>
>
>
> I am not sure how one knows matte black absorbs less but scatters more.
>
It reflects more based on densitometer readings.

Ken Lowther


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