Digital BW, The Print

Paul,

A simple text file with a column of Lab L values or density values  
measured from a 21 step wedge is probably all you need (use a column  
heading of D for density values or L for Lab L values).  Just drag  
and drop the text file onto the Create-icc script and it should  
create both the icc profile and a text file with a plot of the data.

Carl

On Oct 17, 2005, at 8:42 PM, Paul Roark wrote:

> Steve,
>
>
>> ...
>>
>
>
>>> So, does black point compensation mean the curve hits (0,0)?
>>>
>>
>> Yes.  ...
>>
>
> OK, BPC is used to take care of the end point issues, as I  
> understand it.
>
>
>
>> ... in XYZ (for B&W we only care about Y)
>>
>
> I thought Y in CIE XYZ was green.  Or do you mean the Y in xyY?
>
>
>> ...
>> BPC scales the data such that the curve begins at 0,0.
>> So when you send pixel value 0 to the printer
>> it gets left at 0 and hence prints as dark as the printer possibly  
>> can.
>>
>
> This is what I'd want.
>
>
>> ...
>>
>
>
>>> Is the QTR Curve Creator Linearization tab a look-up take interface?
>>>
>>
>> Now it is.
>>
>
>
> I think I'm only able to open the Curves Creator and not the
> "QTR-Create-ICC.exe."  Is this just a Mac program, or does it  
> require i1?
> (It's in the i1 folder.)
>
>
>
>
>> ... [Roy's] aim is to proof hue and luminance correctly.
>>
>
> Ultimately, that could be useful, but for the B&W I'm targeting now  
> it's
> complexity that gets in the way of the basics of B&W printing.
>
>
>> ...  ICC profiles have the advantage
>> that people can set up soft proof in the normal fashion.
>>
>
> That sounds like another complex story.  If we're in PS the custom  
> dot gain
> curves do it, but we do need to get a simpler method.
>
>
> ...
>
>>> Is there a place that describes the specific ways in which a
>>> Windows XP user
>>> can use QTR to make an ICC that can be used in the Print with  
>>> Preview
>>> workflow and then the Epson driver?
>>>
>>>
>> Not sure but it is really very easy.  Print a step wedge with the  
>> workflow
>> of your choice eg Epson Adv B&W with a particular set of  
>> settings.  Scan
>> the
>> step wedge with an EyeOne or other device that will provide the  
>> sort of
>> data
>> QTR Create ICC can read. ...
>>
>
> I'm not sure I can even open Create ICC.  So far I just get a  
> momentary
> flash on the monitor.
>
>
>
>
>
>>> Are those ICCs useable in the Print with Preview procedure
>>> with the Epson driver?
>>>
>>
>>
>
>
>>   Yes I use them all the time.  I have profiled my Epson Adv B&W
>> settings, one for each hue - neutral, warm, sepia and cool.  I do  
>> not mess
>> with the darker and other settings (other than hue).  I prefer to  
>> edit the
>> image in PS rather than in the driver which has limited editing  
>> ability.
>>
>
> The possible advantage with using the driver controls as much as  
> possible is
> that they may well be doing hardware linearization in the driver --  
> with no
> loss of grayscale steps.  The ICC or TF in the Print with Preview  
> -- or
> anywhere in PS -- loses some information with each transformation.
>
> Interesting stuff, but I don't seem to have an easy way to make the  
> ICCs at
> this point.
>
> Paul
> www.PaulRoark.com



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