Digital BW, The Print

I would like to use the whiter of either Epson Ultrasmooth, or Premier 
Art Scrapbook paper for Epson. 

Is ISO brightness a measure of whiteness?, ...because ultrasmooth has 
a ISO of 90 while Premier Art scrapbook is 93. 
Many thanks,
Andrew

Hello Andrew,

>Is ISO brightness a measure of whiteness?

Technically, I don't know.  But in my paper testing I've seen some
warm colored papers that seem brighter than some whiter ones.  So to
me they are two different things.


Regards,
Clayton


Info on black and white digital printing at    
http://www.cjcom.net/digiprnarts.htm

> From: alnchiem [mailto:andrewlee@...]
>
> I would like to use the whiter of either Epson Ultrasmooth, or Premier
> Art Scrapbook paper for Epson.
>
> Is ISO brightness a measure of whiteness?, ...because ultrasmooth has
> a ISO of 90 while Premier Art scrapbook is 93.

No, it's a measure of brightness. ;-)

When you refer to whiteness, are you talking about whiteness versus
grayness, or whiteness versus some color cast? If the former, 93 is
certainly a bit better than 90. If the latter, you might be able to figure
it out if you have some software that lets you see the numeric white point
of the paper's profile: smaller a and b values indicate greater neutrality.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@...

Thanks for all the replies. 

I'm referring to white versus a creamy white, and specifically 
whether Premier Art's Scrapbook paper is whiter than Epson's 
ultrasmooth. 
Many thanks,
Andrew

> 
> When you refer to whiteness, are you talking about whiteness versus
> grayness, or whiteness versus some color cast? If the former, 93 is
> certainly a bit better than 90. If the latter, you might be able to 
figure
> it out if you have some software that lets you see the numeric 
white point
> of the paper's profile: smaller a and b values indicate greater 
neutrality.

> 
> --
> 
> Ciao,               Paul D. DeRocco
> Paul                mailto:pderocco@i...

Although they imply whiteness on most commercial packaging, I believe it is
a measure of "brightness" regardless of true color.  I have held some of the
papers side-by-side that have the same ISO numbers, but appear to be
different shades of white.  Some of "whiteness" will depend on the lighting
and OBAs.

I check white in pure sunlight or an Ott light. Flourescent has that green
cavity and incandescent will warm the appearance of the paper.

Not a great test, but take it to a paint department that has different
lights for looking at their paint chips.

Seth

==-----Original Message-----
==>Is ISO brightness a measure of whiteness?
==

Thanks, Seth. I too check whiteness using sunlight. But I bought a box 
of Infinity Arches paper, which turns out to be creamy, and certanly 
not as white as HPR or Epson's watercolour paper. sigh. 
Andrew

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Seth" <seth@m...
> wrote:
>  Although they imply whiteness on most commercial packaging, I 
believe it is
> a measure of "brightness" regardless of true color.  I have held 
some of the
> papers side-by-side that have the same ISO numbers, but appear to be
> different shades of white.  Some of "whiteness" will depend on the 
lighting
> and OBAs.
> 
> I check white in pure sunlight or an Ott light. Flourescent has that 
green
> cavity and incandescent will warm the appearance of the paper.
> 
> Not a great test, but take it to a paint department that has 
different

> lights for looking at their paint chips.
> 
> Seth
> 
> ==-----Original Message-----
> ==>Is ISO brightness a measure of whiteness?
> ==