Digital BW, The Print

Just a quick follow up to this. Unfortunately it isn't possible to convert
X-rite 810-type colour density readings to CIE Lab. The 810 is a filter
densitometer which is a different beast to a modern spectrodensitometer
which can make both types of readings (although of course, the Vis density
reading can be converted to Lab Lightness).

Howard

> -----Original Message-----
> From: DigitalBlackandWhiteThePrint@yahoogroups.com 
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On 
> Behalf Of Howard Shaw
> Sent: 18 October 2005 11:55
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: RE: [Digital BW] ICC v. Transfer Function in Epson driver
> 
> 
> Steve Kale wrote,
> >
> > From Roy's post announcing the new version that I mentioned
> > in an earlier post (formatting distorted in post):
> > 
> > Supports a more general data input file. Anything
> > columnar,
> > looks for column headings of:
> > 
> > GRAY
> > L, LAB, LAB_L, A, LAB_A, B, LAB_B
> > D, DENSITY, V, VISUAL
> > 
> > 
> The X-rite 810 produces two types of data - density readings 
> (called "Vis") and "RGB" readings for colour information. I 
> understand how to use the Density readings in the text file 
> for Create-ICC but I'm not sure how to convert the RGB 
> readings (which are on the same density scale as the Vis
> readings) to Lab_A & Lab_B. Is this possible?
> 
> Thanks
> Howard
> 
> 
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