Yahoo Groups archive

Digital BW, The Print

Index last updated: 2026-04-28 22:56 UTC

Message

Re: [Digital BW] Calibrating System?

2002-03-21 by lrryr@attbi.com

Barry,

I use a densitometer to build curves for making digital 
negatives with peizo. While I don't have recomendations 
for densitometers I have done an excel spreadsheet that 
takes in densitometer readings from a printed step 
wedge, does the interpolation, and spits out values for 
a correction curve to linearize the steps. If anyone 
would like it to play with let me know.
I started an attempt to produce a curve for the VM inks 
on my 1200 and EAM last weekend, though I didnt have 
time to get far it looked promising. The approach is to 
straighten the steps with the RGB curve alone, then get 
the toning by adjusting the individual inks + and - so 
the density stays constant but the color changes. 
Someone in here mentioned doing exactly that this week 
with success.

A setup procedure for producing VM curves reliably with 
a minimum of iterations is the goal. If anyone else has 
time to work on this it would be great as my time is 
very limited.

Larry
> Hi All,
> Is there anyone using Quad inks that uses a densitometer to 
> calibrate their system? If you do could you please let us know what 
> model densitometer you might use? I am using a windows XP system and 
> are considering the purchase of a X- rite densitometer. 
> I think that it would be a acurate way to set up the monitor and to 
> check the dot gain on my 3000.
> Any comments?
> 
> Barry
> 
> 
> 
> Please visit the Group Homepage to check the Files, Bookmarks, Polls and other 
> resources as they are often being updated. The page is at:
> 
> http://groups.yahoo.com/group/DigitalBlackandWhiteThePrint
> 
> Please follow these basic guidelines:
> - Include your full name with your message.
> - Include the address of your website, if you have one.
> - As threads develop, trim off excess portions of earlier messages to keep them 
> short.
> - As the topic of a thread changes remember to change the subject header.
> - Good manners are required at all time. No personal attacks or "flames."
> - Complete your Yahoo profile.
> - Before posting a question, search the message archives and the various 
> resources on the homepage. 
> 
> 
>  
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 
> 
>

Attachments

Move to quarantaine

This moves the raw source file on disk only. The archive index is not changed automatically, so you still need to run a manual refresh afterward.