Synth-DIY Yahoo! Groups Archives

color sliders

2007-01-09 by Chuck Warner

As a color darkroom worker familiar with enlargers calibrated to 
densitometers in cc units, I am frustrated with sliders expressed in 
percentages or worse, arbitrary numbers. My hope is that someone has a 
conversion of the sliders in PFP2 to cc units. In the simplest form, I 
think that it would be useful if one could adjust the sliders based on 
the visual judgement allowed by the Kodak print viewing filters.

Perhaps C. D. Toby could help with this.

Chuck Warner
Warner Photography

Re: [colorvision_group] color sliders

2007-01-09 by CDTobie@aol.com

In a message dated 1/8/07 11:00:38 PM, warnerphoto@... writes:

As a color darkroom worker familiar with enlargers calibrated to
densitometers in cc units, I am frustrated with sliders expressed in
percentages or worse, arbitrary numbers. My hope is that someone has a
conversion of the sliders in PFP2 to cc units. In the simplest form, I
think that it would be useful if one could adjust the sliders based on
the visual judgement allowed by the Kodak print viewing filters.

Perhaps C. D. Toby could help with this.

Yes, over the years I've had many a photographer tell me that their monitor, or their print, was 5cc too magenta. But of course both the monitor and the printer driver are functioning as RGB devices on a scale of 0-255. Its a matter of learning a new system. Conversions from standard to metric never accomplish much; its learning to think in metric that makes it happen. And this is a case where there is no way to make a consistant conversion anyhow. For instance, the PreciseLight Color Temperature slider: this tool is used to compensate for color metamerism in your prints. How much metamerism you have depend on the ink you are using, and the paper you are using it on. Yes, a color cast could be described in Xcc of Ycolor, but the size of these slider units in CC would be different for every ink/paper combination! So its really not viable.

What you need to learn to trust is the visual results of the sliders. Make a change, move forward to the PFP2 Print Preview screen, with SoftProof checked, and see what it looks like. Move back to the previous screen, adjust the slider again (or adjust another), preview again, and when you think its right, print a HardProof from this screen to be sure. Frankly; its easier than the darkroom process, and much more powerful.

C. David Tobie
Product Technology Manager
ColorVision Business Unit
Datacolor Inc.
CDTobie@...
www.colorvision.com

Datacolor User to User Support Group.

color sliders

color sliders

Re: [colorvision_group] color sliders

Move to quarantaine