Digital BW, The Print

Thank you, Paul.

Unfortunately, my very limited experience with the L*A*B process keeps me from understanding these values in anything but a very approximate and relative sense. I know that if I saw samples, I'd be able to evaluate coloration without a problem, but viewing an array of values is just too disconnected from my visual experience.

RGB values of gray patches would be more helpful, in that I'm very familiar with the process, and I could easily reproduce the colors on my monitor or in print.

Ideally, I'd like to see samples of E-6 on paper, in the flesh. 


On Apr 19, 2012, at 8:40 AM, Paul wrote:

> Dave <cowcreekroad@...> wrote:
> 
>> ... about the 1400/Eboni 6, ...
> 
>> would any of you be willing and able to send me a list of the RGB values you're reading (with a spectrocolorimeter) from a typical Eboni-6/1400 print of a grayscale step wedge? My preferred paper at this point is Entrada Bright, but readings from any paper would be welcome. I'm interested in a color range that's just on the warm side of neutral.
> ...
> 
> 
> 
> My PDF on Eboni-6 has several graphs of the Lab A and B values for various papers.  
> See http://www.paulroark.com/BW-Info/Eboni-6.pdf
> 
> The Lab B measures the yellow (positive) - blue (negative Lab B) of the image.  It is the single best measure of warmth. Both the absolute values and the change from the paper white affect the impression of warmth.  I think you'll find the papers with the low Lab B rise probably meet your criteria of "just on the warm side of neutral."
> 
> Additionally, while I do not have values for the Entrada bright, I do for the natural.  A screen grab of values for it and some others has been uploaded to http://www.paulroark.com/BW-Info/Eb-MoabEntN-others.JPG
> 
> Hope this helps.
> 
> Paul
> www.PaulRoark.com