Digital BW, The Print

Yes you can but you have to compute the points beforehand.  In essence to
replicate what an ICC profile does you simply need to go through the same
maths that is required by the ICC spec plus BPC.  Read the data, scale in
XYZ for white point, and then scale for BPC.  The outbound portion of what
QTR Create ICC does is simply automating this measurement, calculation and
adjustment transformation curve.  The inbound (ie to monitor for soft
proofing) is a whole different kettle of fish.


> From: Paul Roark <paul.roark@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Mon, 17 Oct 2005 13:45:28 -0700
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: RE: [Digital BW] ICC v. Transfer Function in Epson driver
> 
>> 
>> I need to correct myself re my end points comment. PS allows a transfer
>> function that shifts the end points.
> 
> Yes, I missed that also.
> 
> 
>> 
>> If you are thinking of linearising a printer or adjusting image luminance
>> via the transfer curve this ought to be possible.  The trick will be in
>> computing the relevant coordinates.
> 
> I modify curves all the time.   I am attempted to make a simple tutorial for
> these curves at http://home1.gte.net/res09aij/EZ_Adjustment_Curves.htm
> 
> One can load the Image Adjustment *.acv curves into the Transfer Function
> section of Print with Preview.  This avoids the risk of messing up a working
> image file.
> 
> Paul
> www.PaulRoark.com