Digital BW, The Print

Agh!!  Sorry I should have said:

"A conVEX kTRC darkens the print vs linear L*."


> From: Steve Kale <stevekale@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Tue, 09 Aug 2005 10:19:24 +0100
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] QTR ICC  in use
> 
> 
> 
> 
>> From: Roy Harrington <roy@harrington.com>
> :
>>> Roy,
>>> 
>>> Sorry, my wording and conception of ICC are quite approximative.
>>> 
>>> So yes whether grey dot 15,20%, gamma1.8, 2.2... the profile will
>>> still do its job of converting from source to destination. My initial
>>> purpose was just to visualise the QTR ICC in action. Because I don't
>>> understand why when I look at the generic Matte Profile the kTRC is
>>> (far) above the 45° while my QTR ICC is (far) below ? And this should
>>> have nothing to do with working spaces : all is done in QTR with no
>>> CMS. Have done it wrong ? kTRC curve reflects sourceL to destinationL
>>> right ? so my ICC would actually darken the print, while the generic
>>> Matte lightens it ???
>> 
>> I'm beginning to think the discussion so far has been too theoretical.  This
>> sounds like there's something amiss in the workflow -- i.e. the
>> practical side.   You should send me details of what you are doing so
>> I can understand what's happening.
>> 
> 
> Yes.  Oliver - the situation should be the opposite of what you describe
> above.  I am very surprised that you are getting a concave kTRC when the PCS
> is CIELab.  A concave kTRC darkens the print vs linear L*.
> 
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