> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Date: 23 Dec 2003 11:22:45 -0000
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Digest Number 1991
>
>
> Message: 4
> Date: Mon, 22 Dec 2003 20:48:19 +0000
> From: Steve Kale <stevekale@...>
> Subject: Re: Calculating density values with Eye-One
>
> -log10(Y) !! ah stupid fingesr ! :-)
>
>
> From: Steve Kale <stevekale@...>
> Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Date: Mon, 22 Dec 2003 20:42:45 +0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Calculating density values with Eye-One
>
> log10 (Y) delivers right looking values if Y is the Y value from the Measure
> Tool in XYZ divided by 100
>
>
> From: Steve Kale <stevekale@...>
> Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Date: Mon, 22 Dec 2003 20:25:07 +0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Calculating density values with Eye-One
>
> So density is always a negative number? I thought we talked about density
> figures as positive numbers eg a dMax of 1.64. In Roy¹s calibration doc he
> has numbers like 127, 121, 131.... (I am taking the middle number from the
> Sample spot measurement in the XYZ space using Measure Tool¹s Spot
> Measurement function ie a dark black is producing a y value of around 2.0)
>
> Is there a useful book for this kind of stuff?
>
> (Re the Eye-One, I was about to do exactly the same thing.)
>
> Presumably the level of 60 for LK was set using the process described in the
> Calibration document....
>
>
> Ahhh I am getting lost here....
>
>
> From: Carl Schofield <scho@mac.com>
> Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Date: Mon, 22 Dec 2003 14:48:56 -0500
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: Re: [Digital BW] Calculating density values with Eye-One
>
> Steve,
>
> You can calculate density from either the "L" values from the LAB data
> or directly from the "Y" number in the XYZ data:
>
> If L > 8
> Y = ((L + 16)/116)^3
> Else
> Y = (L * 27)/24389
>
> Density = -log10(Y)
>
> I have no problems with the eye-one rubbing on the patches when using
> the strip reader. I have attached an 8.5x11 inch sheet of pictorico
> high gloss white film to the underside of the back edge of the strip
> ruler so the feet on the eye-one slide more smoothly when making strip
> measurements.
>
> Carl
> On Monday, December 22, 2003, at 02:28 PM, Steve Kale wrote:
>
>> From my other posts you can see that I am trying to improve my
>> knowledge of QTR.
>> However, I also have a very basic question potentially applicable to a
>> broader
>> audience. How can I use an Eye-One Photospectrometer to calculate
>> density values. I
>> can see how to take a spot measurement of a patch and get an answer in
>> a variety of
>> colour spaces but how are these then converted to density values?
>>
>> Thanks
>>
>> Steve
>>
>> PS: do others have problems with the Eye-One rubbing along the
>> surface of patch
>> strips when using the strip ruler?
>
>
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