Digital BW, The Print

I've just started some tests with Krystal Topkote in a 2200. I'm
overcoating on a second pass at the moment, and testing it on prints
made using the standard UC-PK/2200 inks and my K3/2200 inks. 

Because my first tests are quick and dirty, I happen to have the
Topkote in the LM slot. If I decide to continue using Topkote I might
move it to the Y slot. I did my first overcoating using IJC/OPM but I
had problems with OPM behaving strangely when only the LM slot was
used in the profile (I've never had that problem before) and OPM is
slow in comparison to the Epson driver in High Speed. So I decide to
use the Epson driver.

To get just the LM ink from the Epson driver, I used an untagged tiff
file and printed that without any colour management. I tried a number
of combinations and, not surprisingly, came up with 255, 126, 255 as
the nearest to only LM ink as far as I could tell. 

Any comments or advice? Has anyone else tried this stuff? I've yet to
get down to evaluating all the tests I've carried out so far, but my
first impressions are good, especially on glossy paper with the UC inks.

Thanks,
Helen

Helen,

If you want to overspray a print you gave already made using a single 
ink channel, the best bet is to use QTR.

Here is how you do it:

(1) You have to create an RGB untagged TIFF file of the size you want 
overprinted.

(2) Fill the entire image with a solid color. The choice of color to 
fill depends on which channel you have loaded your Tipkote. Below I 
list the RGB color values for the LM channel for Topkote.

(3) Save the image as a TIFF, untagged.

(4) Open QTR

(5) Select "calibration" in the options drop-down menu

(6) It will open a default calibration image, so you go 
to "image", "select image" to open your file.

(7) Print, and viola!

You have the option of selecting ink (Topkote coverage in 5% 
increments.

Good luck and let us know how it works out.

Shilesh

Below are the RGB numbers for LM:

The numbers R=251 and B=255 remains the same for all %. The number G 
is listed

5% = 242
10% = 230
15% = 217
20% = 204
25% = 191
30% = 179
35% = 166
40% = 153
45% = 140
50% = 128
55% = 115
60% = 102
65% = 89
70% = 77
75% = 64
80% = 51
85% = 38
90% = 26
95% = 13
100% = 0




--- In DigitalBlackandWhiteThePrint@...m, "helen_bach2003" 
<helenbach@h...> wrote:
>
> I've just started some tests with Krystal Topkote in a 2200. I'm
> overcoating on a second pass at the moment, and testing it on prints
> made using the standard UC-PK/2200 inks and my K3/2200 inks. 
> 
> Because my first tests are quick and dirty, I happen to have the
> Topkote in the LM slot. If I decide to continue using Topkote I 
might
> move it to the Y slot. I did my first overcoating using IJC/OPM but 
I
> had problems with OPM behaving strangely when only the LM slot was
> used in the profile (I've never had that problem before) and OPM is
> slow in comparison to the Epson driver in High Speed. So I decide to
> use the Epson driver.
> 
> To get just the LM ink from the Epson driver, I used an untagged 
tiff
> file and printed that without any colour management. I tried a 
number
> of combinations and, not surprisingly, came up with 255, 126, 255 as
> the nearest to only LM ink as far as I could tell. 
> 
> Any comments or advice? Has anyone else tried this stuff? I've yet 
to
> get down to evaluating all the tests I've carried out so far, but my
> first impressions are good, especially on glossy paper with the UC 
inks.

> 
> Thanks,
> Helen
>

Helen, which formulation are you using? (WJ822 or WJ824) And what 
color is the liquid?

Thanks Shilesh, if I decide to try QTR I'll give that a go. What
advantages does it have over just using the Epson driver for this
particular purpose? What advantages would it have over IJC/OPM?

I fixed the problem in OPM by making a profile that used more active
inks, but with all of their ink curves zeroed at zero pixel value (my
coating image is all black). But OPM is still a lot slower than the
Epson driver, and speed appears to help in the avoidance of faint
wheel marks. 

As an aside, why does 251, 0, 255 result in QTR delivering 100% LM
rather than 100% M?

Thanks,
Helen

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Shilesh Jani"
<shileshjani@b...> wrote:

>
> Helen,
> 
> If you want to overspray a print you gave already made using a single 
> ink channel, the best bet is to use QTR.
> 
> Here is how you do it:
> 
> (1) You have to create an RGB untagged TIFF file of the size you want 
> overprinted.
> 
> (2) Fill the entire image with a solid color. The choice of color to 
> fill depends on which channel you have loaded your Tipkote. Below I 
> list the RGB color values for the LM channel for Topkote.
> 
> (3) Save the image as a TIFF, untagged.
> 
> (4) Open QTR
> 
> (5) Select "calibration" in the options drop-down menu
> 
> (6) It will open a default calibration image, so you go 
> to "image", "select image" to open your file.
> 
> (7) Print, and viola!
> 
> You have the option of selecting ink (Topkote coverage in 5% 
> increments.
> 
> Good luck and let us know how it works out.
> 
> Shilesh
> 
> Below are the RGB numbers for LM:
> 
> The numbers R=251 and B=255 remains the same for all %. The number G 
> is listed
> 
> 5% = 242
> 10% = 230
> 15% = 217
> 20% = 204
> 25% = 191
> 30% = 179
> 35% = 166
> 40% = 153
> 45% = 140
> 50% = 128
> 55% = 115
> 60% = 102
> 65% = 89
> 70% = 77
> 75% = 64
> 80% = 51
> 85% = 38
> 90% = 26
> 95% = 13
> 100% = 0

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Greg"
<dfaprinting@y...> wrote:
>
> Helen, which formulation are you using? (WJ822 or WJ824) And what 
> color is the liquid?
>

Greg,
I'm using 822, which has a very light yellow tint. Are you familiar
with this stuff?
Best,
Helen

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "helen_bach2003" 
<helenbach@h...> wrote:
>
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Greg"
> <dfaprinting@y...> wrote:
> >
> > Helen, which formulation are you using? (WJ822 or WJ824) And what 
> > color is the liquid?
> >
> 
> Greg,
> I'm using 822, which has a very light yellow tint. Are you familiar
> with this stuff?
> Best,
> Helen
>

Not directly, but the last time I inquired about it, they (Walter?) 
told me they have a newer version than the WJ822. I'm pretty sure the 
new version is WJ824 or GLOP for the R800/1800. It might be worth 
looking into the WJ824 if you like what the WJ822 is doing for you. 
You can get 500ml (or larger) from http://www.getinkexpress.com , and 
smaller amounts at http://www.weink.com

Helen,

I cannot comment on IJC/OPM -never used it. Over the Epson driver, 
the advantage of my QTR method is that only the chosen channel will 
fire. We don't know how the Epson driver works, so there is no 
telling which color values will fire only one channel.

The numbers I reported to you were picked off from the 
QTR "calibration" image. Roy Harrington (or someone else) has 
generated specific color numbers to fire each single ink channel at 
5% increments so as to to find ink limits.

It would be very, very easy for you to try. If you are on a PC I can 
walk you through it. E mail me off-list if interested.  BTW, I know 
of this trick because I use it if I want to purge ink from just one 
channel - I am always trying out new inks ;-(.

Shilesh

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "helen_bach2003" 
<helenbach@h...> wrote:
>
> Thanks Shilesh, if I decide to try QTR I'll give that a go. What
> advantages does it have over just using the Epson driver for this
> particular purpose? What advantages would it have over IJC/OPM?
> 
> I fixed the problem in OPM by making a profile that used more active
> inks, but with all of their ink curves zeroed at zero pixel value 
(my
> coating image is all black). But OPM is still a lot slower than the
> Epson driver, and speed appears to help in the avoidance of faint
> wheel marks. 
> 
> As an aside, why does 251, 0, 255 result in QTR delivering 100% LM
> rather than 100% M?
> 
> Thanks,
> Helen
> 
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Shilesh Jani"
> <shileshjani@b...> wrote:
> >
> > Helen,
> > 
> > If you want to overspray a print you gave already made using a 
single 
> > ink channel, the best bet is to use QTR.
> > 
> > Here is how you do it:
> > 
> > (1) You have to create an RGB untagged TIFF file of the size you 
want 
> > overprinted.
> > 
> > (2) Fill the entire image with a solid color. The choice of color 
to 
> > fill depends on which channel you have loaded your Tipkote. Below 
I 
> > list the RGB color values for the LM channel for Topkote.
> > 
> > (3) Save the image as a TIFF, untagged.
> > 
> > (4) Open QTR
> > 
> > (5) Select "calibration" in the options drop-down menu
> > 
> > (6) It will open a default calibration image, so you go 
> > to "image", "select image" to open your file.
> > 
> > (7) Print, and viola!
> > 
> > You have the option of selecting ink (Topkote coverage in 5% 
> > increments.
> > 
> > Good luck and let us know how it works out.
> > 
> > Shilesh
> > 
> > Below are the RGB numbers for LM:
> > 
> > The numbers R=251 and B=255 remains the same for all %. The 
number G 

> > is listed
> > 
> > 5% = 242
> > 10% = 230
> > 15% = 217
> > 20% = 204
> > 25% = 191
> > 30% = 179
> > 35% = 166
> > 40% = 153
> > 45% = 140
> > 50% = 128
> > 55% = 115
> > 60% = 102
> > 65% = 89
> > 70% = 77
> > 75% = 64
> > 80% = 51
> > 85% = 38
> > 90% = 26
> > 95% = 13
> > 100% = 0
>

I may as well give QTR a go for this, and compare it to the Epson
driver. The thing about using a clear coat is that it is easy to see
if any other ink is firing. Apart from the colour, if anything else is
present in trace amounts you can see the dots under a strong loupe. I
can also compare the Epson driver results with the OPM results - which
certainly have only one channel in use. I hadn't expected the
theoretical RGB values for LM to work because of the 'impurity'
(departure from true magenta) of the ink (ie I had expected the driver
to account for the impurity), but it does seem that if you switch all
colour management off you will get just the LM for 255,126,255.

Whichever way I use it, this is a lot easier and more consistent than
using a spray gun. We were going to experiment with Eco Printshield,
and we approached Premier for advice, but they didn't reply to our
request.

Best,
Helen

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Shilesh Jani"
<shileshjani@b...> wrote:
>
> Helen,
> 
> I cannot comment on IJC/OPM -never used it. Over the Epson driver, 
> the advantage of my QTR method is that only the chosen channel will 
> fire. We don't know how the Epson driver works, so there is no 
> telling which color values will fire only one channel.
> 
...

Hmm, interesting. I just got the 822 from getinkexpress a few days
ago, and I saw no mention of 824. I'll call Image Specialists tomorrow.

Thanks,
Helen

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Greg"
<dfaprinting@y...> wrote:

> Not directly, but the last time I inquired about it, they (Walter?) 
> told me they have a newer version than the WJ822. I'm pretty sure the 
> new version is WJ824 or GLOP for the R800/1800. It might be worth 
> looking into the WJ824 if you like what the WJ822 is doing for you. 
> You can get 500ml (or larger) from http://www.getinkexpress.com , and 
> smaller amounts at http://www.weink.com
>