Digital BW, The Print

> From: Roy Harrington <roy@...>
:
>> 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*.