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assign 2 inks to same curve partition?

assign 2 inks to same curve partition?

2015-08-17 by tyler@...

I recall this was doable..
For testing purposes I need to run 2 inks the same.. not 50/50 as could easily be done in the driver, but 2 inks "parallel", if you will, all the way from 1 - 100%. Preferably as the K partition.
Was it simply setting the numbers the same in the descriptor file?
Thanks,
Tyler


Re: assign 2 inks to same curve partition?

2015-08-17 by Greg Franco

Tyler,

I have done this before... you can either set both inks as gray inks with the same density and limits or have one ink copy the curve of the other.... when you preview the graph of the curve you should just get one line since they will be overlapping.  The line should go diagonally, lower left to upper right, from 0 to 100. Make sure the highlight and shadow values under the Gray Curve tab are set to 0.

Greg.

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Re: assign 2 inks to same curve partition?

2015-08-17 by brian_downunda@...

I assume that this is in relation to your WN1 testing on CRP. I thought you had already come to a conclusion on that. If I've completely misinterpreted what you're asking, then please ignore this message.

The colour coding in the QTR ink separation page indicates which ink position will be used to print each row in calibration mode. Each column has a difference combination of Red and Blue at 100%, and then gradually Green is introduced to reduce density down from 100%. On the R1900, shade 1 is in the PK channel, and the colour code for 100% is (253,0,255) (R,G,B).

If you want to put a second shade 1 into another slot and just print the two shade 1's to compare and measure, then you just need to print the two rows from the ink separation page that correspond to the two slots where the inks are.

If this is about the R1900, then the ink separation page has incorrect labels for the cart positions. I posted the mapping between the R1900 and the ink sep page labels in my comments on this post:
http://www.inkjetmall.com/tech/content.php?166-Flush-individual-channel-using-QTR-Calibration-Mode

Re: assign 2 inks to same curve partition?

2015-08-18 by richard@...

Tyler, this might do what you are attempting: Brain's suggestion will work if you are trying to print each ink separately but what follows below will get two inks printing at the same time one on top of the other.

Set the ink limits the same value for the 2 channels you want to use, and set the rest of the channels to 0.
Set the N_OF_GRAY_PARTS=1

Set

GRAY_INK_1=K
GRAY_VAL_1=100

Make the gray_highlight/shadow=0 as Greg said (to get a straight line from 0-100), but instead of making both cross over points 100 make the at the end of the descriptor file paste in COPY_CURVE_(the ink you're using)=K

If you try to set both inks to use the same gray val then one channel gets canceled out. This is the case if you set both inks to GRAY_INK_1= and GRAY_VAL_1=100 as well as setting the second ink to GRAY_INK_2= and GRAY_VAL_2=100. In the text based graph it might look like the C is on top of the K curve, but if you open the quad file CurveView you'll find that only one of the inks is being used (there is only 1 ink with an ink limit that is not "0" )
I pasted an example ink descriptor file below which should work for what you need it to do. You will need to make a few changes depending on the number of inks your printer uses, and the ink limit that you want to print with. I stripped out all the stuff that is not needed and there shouldn't be a problem with it if you're working on a Mac.

Hope that helps,

Richard Boutwell




PRINTER=Quad1430-k6
CURVE_NAME=Shade2on1
GRAPH_CURVE=YES
N_OF_INKS=6
DEFAULT_INK_LIMIT=0
LIMIT_K=75
LIMIT_C=75
LIMIT_M=0
LIMIT_Y=0
LIMIT_LC=0
LIMIT_LM=0
# GRAY VALUE CROSS-OVER POINTS
N_OF_GRAY_PARTS=1
GRAY_INK_1=K
GRAY_VAL_1=100
# GRAY CURVE INFORMATION
GRAY_HIGHLIGHT=0
GRAY_SHADOW=0
GRAY_OVERLAP=0
GRAY_GAMMA=1
GRAY_CURVE=
# Ink Curves
COPY_CURVE_C=K


Re: [QuadtoneRIP] assign 2 inks to same curve partition?

2015-08-18 by Roy Harrington

As Richard has said - COPY_CURVE is the way too go. Same ink limits too.

Roy
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On Monday, August 17, 2015, richard@... [QuadtoneRIP] <QuadtoneRIP@yahoogroups.com> wrote:


Tyler, this might do what you are attempting: Brain's suggestion will work if you are trying to print each ink separately but what follows below will get two inks printing at the same time one on top of the other.

Set the ink limits the same value for the 2 channels you want to use, and set the rest of the channels to 0.
Set the N_OF_GRAY_PARTS=1

Set

GRAY_INK_1=K
GRAY_VAL_1=100

Make the gray_highlight/shadow=0 as Greg said (to get a straight line from 0-100), but instead of making both cross over points 100 make the at the end of the descriptor file paste in COPY_CURVE_(the ink you're using)=K

If you try to set both inks to use the same gray val then one channel gets canceled out. This is the case if you set both inks to GRAY_INK_1= and GRAY_VAL_1=100 as well as setting the second ink to GRAY_INK_2= and GRAY_VAL_2=100. In the text based graph it might look like the C is on top of the K curve, but if you open the quad file CurveView you'll find that only one of the inks is being used (there is only 1 ink with an ink limit that is not "0" )
I pasted an example ink descriptor file below which should work for what you need it to do. You will need to make a few changes depending on the number of inks your printer uses, and the ink limit that you want to print with. I stripped out all the stuff that is not needed and there shouldn't be a problem with it if you're working on a Mac.

Hope that helps,

Richard Boutwell




PRINTER=Quad1430-k6
CURVE_NAME=Shade2on1
GRAPH_CURVE=YES
N_OF_INKS=6
DEFAULT_INK_LIMIT=0
LIMIT_K=75
LIMIT_C=75
LIMIT_M=0
LIMIT_Y=0
LIMIT_LC=0
LIMIT_LM=0
# GRAY VALUE CROSS-OVER POINTS
N_OF_GRAY_PARTS=1
GRAY_INK_1=K
GRAY_VAL_1=100
# GRAY CURVE INFORMATION
GRAY_HIGHLIGHT=0
GRAY_SHADOW=0
GRAY_OVERLAP=0
GRAY_GAMMA=1
GRAY_CURVE=
# Ink Curves
COPY_CURVE_C=K






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