Digital BW, The Print

Roy, Yes, Color management has been a round in PS for many generations. And
the values to look at are not just the RGB values. But that doesn't answer
the question of,  "Has the conversion to grayscale been the same from PS6
through CS4 the same"?. Are those stating the best way to scan is from RGB
convert to gray in PS talking about a particular workflow; scanner, software
with Version, PS what version, etc. Without the stated workflow, the answers
may not be valid today with the next users workflow. 

 

The issue surrounding what conversion method Adobe uses when applying
convert to gray have presented themselves because we have received various
answers without a version and source. I have contacted several people that
work in the industry and have either direct working relationships with Adobe
or deal with writing plug ins for Adobe products. I have received
indications that at one point they used a conversion that included the RGB %
values that were stated. It was expressed to me that at some point that was
true, but has since changed to more of the HSL conversion method.  I really
don't care as I use other methods to convert a RGB file to a K. 

 

Rereading the answer to the OP, Peter answered it; it depends on the
software. But I  also say what hardware too. 

 

The thread moved away from just what the scanner does to how PS converts to
gray -K. Including references to books, contacts, etc and we have several in
the specific values camp of RGB and some that are in the HSL camp. I am
saying it sounds that both are valid for various times in the life of Adobe
PS. And now we have Lightroom that will take a scan and whether it was
output from the scanner with a gamma 2.2 or whatever, will output it as an
RGB file to PS and beyond. 

 

So to Dale, run tests in the scanning software to determine what works best
for your set up paying attention to the controls available for noise, focus,
etc. All things that contribute to the proper exposure for your image
intent.     

 

 

Eric Neilsen

4101 Commerce Street, Suite 9

Dallas, TX 75226

214-827-8301

 

www.ericneilsenphotography.com

SKYPE ejprinter

 

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Roy
Harrington
Sent: Saturday, January 10, 2009 12:23 PM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: B+W Scans from RGB Scanners

 

--- In DigitalBlackandWhiteThePrint@yahoogroups.com
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com> , "Eric Neilsen"
<e.neilsen2@...> 
wrote:
>
...
> 
> 
> And Roy, Do you know for what version of PS your information pertains to?
> All? 

Hi Eric,

Color Management has been used for Photoshop Mode conversions for quite
a while. At least all the CS versions (CS,CS2,CS3,CS4) do it that way.
It's also worth mentioning that the Info Palette also uses this. If you
display say
RGB values when you have a grayscale file, you are seeing the ICC converted
values based on the RGB working space. In other words since K values are
displayed in values 0-100 you don't see the full 8 bits that are really
there.
Often people will look at the RGB values 0-255. But they aren't the files
values
they are the converted values from K to RGB -- matching Lab Luminosity.

Roy

> 
> 
> Personal testing is still the order of the day. 
> 

Yes, testing is always worthwhile. It's a great way to learn what's going on
"under the hood" -- if you are curious about it.

R

> 
> 
> 
> Eric Neilsen Photography
> 
> 4101 Commerce Street
> 
> Suite 9
> 
> Dallas, TX 75226
> 
> http://e.neilsen.home.att.net
> 
> http://ericneilsenphotography.com
> 
> Skype ejprinter
> 
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com> 
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com> ] On Behalf Of
br80906
> Sent: Friday, January 09, 2009 9:59 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
<mailto:DigitalBlackandWhiteThePrint%40yahoogroups.com> 
> Subject: [Digital BW] Re: B+W Scans from RGB Scanners
> 
> 
> 
> Please check out this page...it helped me a ton on b/w conversion.
> You need to experiment w/your scanner, but the end result will give
> you what you are looking for...
> 
> http://www.butzi.net/articles/colorscan.htm
> 
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>

 



[Non-text portions of this message have been removed]