Digital BW, The Print

Hi, everyone, I'd like to know how to make curve for the glop channel,
I'm using epson 2400 and qtr, with datacolor densitometer.
How can I properly limitate the glop?

In the second, 
I read about a spray that can be used after drying prints, and that
protect them (I'm talkin about glossy semi-glossy prints) and that can
be used in place of gloss, but is it usefull also to reduce bronzing
or is it just for protection?

thx a lot

hand

sab

I frequently use Premier Art Print Shield on Epson Premium Glossy
paper, and also luster papers.  It does an excellent job of
eliminating gloss differential.  I don't have problems with bronzing
(your question) with the K3 inks with my 7800 and I would be surprised
if this is a problem with your Epson 2400 (also K3 inks?).  Bronzing
was in issue with my older Epson 4000 (Ultrachrome ink) and as I
recall Print Shield helped a bit for that too.

Print Shield is easy to use on luster papers (and probably
semi-glossy).  It goes on evenly.  It is more difficult to use with
Glossy papers but I am almost always successful.  You need to lay it
on thick, not just a light mist.  Hold the can vertical, parallel to
the almost vertical print, and close (about 8 inches) from the print
and move it smoothly back and forth, overlapping strokes in a
descending s-pattern. Be very careful to go way past the end of the
print so you don't put too much down when making your turns.  Practice
your movements first before spraying.  Dust off the print before
spraying.  Afterward, don't panic if side lighting shows minor
'puddles'... they typically dry fine.  If you fear a drip is forming
before drying turn the print horizontal to dry.  Prints larger than
16x20 are harder to do but can be done as you get more practice.  For
large prints using two cans at once (one in each hand pointing at the
same spot) can work well.  Spray in a well ventilated but not windy
area... and wear paint respirator.

It's really not very difficult and like I said, does a great job of
eliminating gloss differential.

Good luck,
Ken



--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "arcibombolina"
<sabenel@...> wrote:

>
> Hi, everyone, I'd like to know how to make curve for the glop channel,
> I'm using epson 2400 and qtr, with datacolor densitometer.
> How can I properly limitate the glop?
> 
> In the second, 
> I read about a spray that can be used after drying prints, and that
> protect them (I'm talkin about glossy semi-glossy prints) and that can
> be used in place of gloss, but is it usefull also to reduce bronzing
> or is it just for protection?
> 
> thx a lot
> 
> hand
> 
> sab
>

> if this is a problem with your Epson 2400 (also K3 inks?).  Bronzing
> was in issue with my older Epson 4000 (Ultrachrome ink) and as I
> recall Print Shield helped a bit for that too.

I use mis UT inks, and they are great but not encapsulated as for the
k3 so bronzing is a big matter

 
> Print Shield is easy to use on luster papers (and probably
> semi-glossy).  It goes on evenly.  It is more difficult to use with
> Glossy papers but I am almost always successful. 

Thx a lot for your answer, is it glossy paper harder to work cause it
doesn't catch spray immediately?

And is one pass enough or it requires multiple passes?

thx

> Hi, everyone, I'd like to know how to make curve for the glop channel,
> I'm using epson 2400 and qtr, with datacolor densitometer.
> How can I properly limitate the glop?

I use 'Load curve' on the GLOP channel, then click 'Point list' to add
points manually. For the UT7 inkset I used 0 60 100 30. This will add
60% GLOP to white going down in a straight line to 30% in the blacks.
You probably need to experiment with your inkset and see what works.
Often more GLOP is needed in the highlights than the shadows. You also
have to watch out so you don't oversaturate the paper with ink.
Mottling and loss of detail is usually a sign of too much ink.
Remember to reduce any whites in the images you print from 255 to 254
as 255 will not have any GLOP applied no matter what you to.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "danielstaver"
<daniel@...> wrote:
>
> > Hi, everyone, I'd like to know how to make curve for the glop channel,
> > I'm using epson 2400 and qtr, with datacolor densitometer.
> > How can I properly limitate the glop?

> You also
> have to watch out so you don't oversaturate the paper with ink.
> Mottling and loss of detail is usually a sign of too much ink.

So, if glop gives problem I'd better limitate again ink and not glop
channel? (ie to 0 50, 100 20 ?), and If I have a default ink limit (ie
55%)setted I give to glop 100% limitation or I let the default limit
also for the glop ?

> Remember to reduce any whites in the images you print from 255 to 254
> as 255 will not have any GLOP applied no matter what you to.

Yes, thx a lot

sab

> So, if glop gives problem I'd better limitate again ink and not glop
> channel? (ie to 0 50, 100 20 ?), and If I have a default ink limit (ie
> 55%)setted I give to glop 100% limitation or I let the default limit
> also for the glop ?

Whether you change the curve points or reduce the ink limit doesn't
matter. A curve with 0 100 100 50 and a 50% ink limit is the same as a
curve with 0 50 100 25 and a 100% ink limit. If your curve has a
complex shape and you just want to adjust the strength it's certainly
faster to just change the ink limit.

Pay attention to the curve graph when you generate your curve. It will
tell you the strength and shape of each curve after all ink limits and
other adjustments have been applied. Sometimes when I'm uncertain what
a combination of settings will do I make an adjustment, generate the
curve and look at the graph to see how it changed.

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "arcibombolina" 
<sabenel@...> wrote:
... 
>  
> > Print Shield is easy to use on luster papers (and probably
> > semi-glossy).  It goes on evenly.  It is more difficult to use with
> > Glossy papers but I am almost always successful. 
> 
> Thx a lot for your answer, is it glossy paper harder to work cause it
> doesn't catch spray immediately?
> 
> And is one pass enough or it requires multiple passes?
> 

Glossy paper is harder to work with because the reflective surface is 
less forgiving of 'mistakes' i.e. uneven spray laydown or minor drips. 

For prints up to 14 x 17 inches I try (and almost always succeed)with  
only one coat.  If you are working on a luster paper you can put 
another coat on if you feel you've missed an area and probably fix any 
uneveness.  If you are trying to put a second coat on glossy I have 
found I may make the uneveness worse... so it is best to get it right 
the first time with glossy surfaces.

Ken

> > And is one pass enough or it requires multiple passes?
> > 
> 
> Glossy paper is harder to work with because the reflective surface is 
> less forgiving of 'mistakes' i.e. uneven spray laydown or minor drips. 
> 
> For prints up to 14 x 17 inches I try (and almost always succeed)with  
> only one coat.  If you are working on a luster paper you can put 
> another coat on if you feel you've missed an area and probably fix any 
> uneveness.  If you are trying to put a second coat on glossy I have 
> found I may make the uneveness worse... so it is best to get it right 
> the first time with glossy surfaces.
> 
> Ken


perfect, I'll try it!
Is it print shield different from eco print shield glossy?
Actully in europe I can just find the second one, perhaps I'll order
fom usa.

thx a lot ken

sab