Digital BW, The Print

OK now that I am back at my computer I can see how one might "hack" the
.quad file and enter in values for the ink slot that contains the gloss
optimiser.  But I have some questions:

* what is the scale in the quad ink curves?  Is it just 16bit ie 0 to
65,536? (looks like it is)
* as the inks are additive then one could presumably calc the inverse and
record it in the gloss optimizer slot
* will gloss optimizer affect the curve design and linearisation process ie
does it affect density readings?  I guess this could be tested.  If it
doesn't affect density in any way then the process of incorporating gloss
optimiser into QTR's front end would be greatly simplified.
* would it be sensible to assume that an ink limit for the gloss optimizer
set at the same level as K would be about right?  Ie that gloss optimiser
has the same "coverage" as K.  Then 0 density would be set at K's 256 value
and subsequent values simply set at this less the lay down for the other
active inks.





> From: koloshor <wiz@...>
> Reply-To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Date: Sat, 27 Nov 2004 19:20:54 -0000
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Subject: Re: [Digital BW] Bronzing - A Crazy Idea
> 
> 
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Steve Kale"
> <stevekale@b...> wrote:
>> 
>> Then here is an issue. QTR can only treat gloss as an ink, laying it down
>> lightly in the highlights and heavily in the shadows. It cant do the inverse
>> (in present form).
> 
> Sure, it can. Have a look at one of the .quad files, and you'll see.
> For an 
> Epson 2200 file, there are seven curves in the file. Each one controls a
> particular "channel". Each has 256 values, ranging from pure white to pure
> black. Typically, all seven curves start at 0, some might stay at zero, and
> others increase or decrease.
> 
> I'm uploading a version of EEM_2200-warm.quad where I've added a dash (4.3%,
> to be exact) of yellow in the no-ink areas. This is not for serious use, just
> an experiment in "filling in" GLOP. It will print ourtageously ugly (yellow is
> yellow, after all) on glossy paper with PK (not MK) ink, but it will show you
> a reasonably "bronzing free" print. 4.3% isn't the proper value, I suspect
> ssomething closer to 8% would be better. But it's a taste.
> 
>> I suspect the lay down of gloss is a lot more complex. For example the R800
>> has the option to lay down gloss outside the image area suggesting that it
>> likely does need to be laid down where there is no ink.
> 
> In QTR, that option is always turned on. QTR will lay down whatever the curves
> tell it is zero density in the entire paper area. So you're going to use a lot
> of GLOP.
> 
> 
> 
> 
> 
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