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tweaking a qidf file to compensate for clogs

tweaking a qidf file to compensate for clogs

2018-10-27 by paulmwhiting@...

I finally got my nozzle checks to show a total lack of clogs (using Cb6 in an Epson 1400) with one exception, the Cyan position. I've already run the syringe push/pull technique which took care of some clogs but not all. I have about seven stubborn empty dashes in the Cyan nozzle check . I figure that's about 7%. What if I were to increase one of the parameters in the qidf, increasing the value by 7%? I know next to nothing about which parameter does what, but let's assume it's the LIMIT entry. It's now 30 so a 7% increase would be about 32. (Maybe it's some other parameter, please advise.)

Or should I simply re-linearize the file? I can now use the Stepwedge Tool now, pretty slick.

Or why not do another syringe push/pull? Truth is, I've done it once, it went smoothly but I'm reluctant about doing it again.

Or is a 93% cart with 30% dilution even noticeable?

Thanks all,

Paul W.



Re: [Digital BW] tweaking a qidf file to compensate for clogs

2018-10-27 by Paul Roark

If you're running a B&W inkset, you can just alter a profile to minimize the problem channel and relinearize. What inkset are you running?

Paul
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On Sat, Oct 27, 2018 at 10:09 AM paulmwhiting@... [DigitalBlackandWhiteThePrint] <;DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:

I finally got my nozzle checks to show a total lack of clogs (using Cb6 in an Epson 1400) with one exception, the Cyan position. I've already run the syringe push/pull technique which took care of some clogs but not all. I have about seven stubborn empty dashes in the Cyan nozzle check . I figure that';s about 7%. What if I were to increase one of the parameters in the qidf, increasing the value by 7%? I know next to nothing about which parameter does what, but let's assume it's the LIMIT entry. It's now 30 so a 7% increase would be about 32. (Maybe it's some other parameter, please advise.)

Or should I simply re-linearize the file? I can now use the Stepwedge Tool now, pretty slick.

Or why not do another syringe push/pull? Truth is, I've done it once, it went smoothly but I'm reluctant about doing it again.

Or is a 93% cart with 30% dilution even noticeable?

Thanks all,

Paul W.



Re: [Digital BW] tweaking a qidf file to compensate for clogs

2018-10-30 by paulmwhiting@...

Thanks Paul,

The profile I'm using is one of yours, EbVT-PA-FA205-Neutral. (For the benefit of a wider readership, it makes use of the Y cartridge filled with a blue toner to make the print less warm.) For space reasons here I'm only posting the Neutral version. Since we're talking about tweaking the Cyan cart to compensate for its clogs, I think it's only necessary to show one profile. I could have just as well posted the Warm version. I usually print using both curves at 50% - I like having being able to change the warm-cool mix to my tastes.

Paul W.

#Notes Feb 20, 2016
#Notes Rob de Loe
#Notes
#Notes Paul Roark's generic curve is starting point
#Notes Instead of using supplied values, I re-calibrated everything.
#Notes Uses M and LM as toner curves; total ink load of 40 is divided between them
#Notes Paul's generic assumed ink limit of 35, but I read 40 (so limits for toners are 20) and limit for Y is
#Notes 40/2.5=16
#Notes Linearized and had to fudge the darkest value; the ColorMunki read 19; it normally dries down by 0.2
#Notes so I dropped it down to 18.8 and it linearized fine. The curves look ugly, but it works
#Notes Y is a load curve that runs across the whole thing; his original neutral curve was designed for 10%
#Notes Y, but I'm using 25% Y so divided by 2.5 to get to 16.
#Notes
PRINTER=Quad1400-MIS
CURVE_NAME=EbVT-PA-FA205-Neutral
GRAPH_CURVE=YES
N_OF_INKS=6
DEFAULT_INK_LIMIT=40
BOOST_K=45
LIMIT_K=40
LIMIT_C=30
LIMIT_M=20
LIMIT_Y=16
LIMIT_LC=20
LIMIT_LM=20
N_OF_GRAY_PARTS=3
GRAY_INK_1=K
GRAY_VAL_1=100
GRAY_INK_2=C
GRAY_VAL_2=55
GRAY_INK_3=LC
GRAY_VAL_3=24
GRAY_HIGHLIGHT=10
GRAY_SHADOW=10
GRAY_OVERLAP=
GRAY_GAMMA=1
GRAY_CURVE=
N_OF_TONER_PARTS=2
TONER_INK_1=M
TONER_VAL_1=39
TONER_INK_2=LM
TONER_VAL_2=17.5
TONER_HIGHLIGHT=10
TONER_SHADOW=10
TONER_GAMMA=1
TONER_CURVE=
N_OF_TONER_2_PARTS=0
TONER_2_HIGHLIGHT=10
TONER_2_SHADOW=10
TONER_2_GAMMA=1
TONER_2_CURVE=
N_OF_UNUSED=0
CURVE_Y="0;0 10;4.7 20;13 30;22 40;31 50;46 60;61 70;85 75;91 80;89 85;81 90;61 95;35 100;0 """""""""
LINEARIZE="95.808479 92.117378 87.917824 83.138885 77.696144 72.914581 66.704521 60.622429 55.298779 49.439247 43.184006 38.032261 33.246773 29.592039 26.246315 23.846638 22.383198 20.462576 18.758568 17.984755 17.808918 "

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