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     áòèé÷ :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

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Re: filmscanners: Is IT8 Data transferrable?



For what it's worth, Ian, I found your explanation clear, and saved it in my Photoshop Tips folder. Thanks... and I'm very glad that you posted it on list.
Hersch

At 02:47 PM 10/15/2001, you wrote:

Can I use these with other scanner calibration
> software? If so, which?

It should be possible to use them with most scanner profiling packages.
Probably the cheapest and probably best at present is ICC-Scan from Profile
City http://www.profilecity.com


> Another question: I've tried to correlate the figures in these tables
> with PS onscreen densitometer readings but can't get anything
> meaningful.


It will be difficult since the first three are CIE XYZ definitions for each
patch. The Lab L, A and B are the ones most likely to make sense, but even
then Photoshop will only handle integer numbers in Lab mode and the Lab C is
chroma - you call it saturation. It is the measure of distance of the colour
from neutral point. Lab H is Hue - this is the measured angle of the colour
from the +a axis on the Lab diagram and is measured in degrees. If you think
of a colour wheel with dead centre being neutral and all the fully saturated
colours around the circumference of the wheel you'll get the idea regarding
LabCH


Ian Lyons

http://www.computer-darkroom.com



 




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