TVI for hybrid screening

[Alien]

Hello everyone.

What "Tone Value Increase" curve can be used with hybrid screening?

We plane to use Kodak Maxtone.
Ctp - Kodak Magnus VLF Quantum.

Any help is appreciated

P.S. Please move this theme to "Computer to Plate"

 

[gordo]

What "Tone Value Increase" curve can be used with hybrid screening?
We plane to use Kodak Maxtone.
Ctp - Kodak Magnus VLF Quantum.

You use the same curve that you would use for a standard AM screen at the same lpi.
If you are going to a higher lpi then you use a dot gain compensation curve applied to the plate that provides the same tone reproduction in the presswork that you get with your current screening.

best, gordo

 

[THYum]

If we set the standard of our printing under the GRACoL2006 coated 1. There is a no. shown us -7.41 at 50% yellow color. What is that means?
That means the printed result at 50% is equal to 50% + 14%(allowed TVI) + 7.41% =71.41% or 50% - 7.41% = 57.49%. Which one is correct? Please help.

 

[gordo]

If we set the standard of our printing under the GRACoL2006 coated 1. There is a no. shown us -7.41 at 50% yellow color. What is that means?
That means the printed result at 50% is equal to 50% + 14%(allowed TVI) + 7.41% =71.41% or 50% - 7.41% = 57.49%. Which one is correct? Please help.

Where are you getting the number -7.41 from?

best, gordo

 

[THYum]

Color management

Color management

From the printed sheet and reported by QuadTech CCS system. A table is shown us the figure at 50% yellow color is -7.41%. So I need someone tell us the real % of the half tone. The -7.41% is guided us how many % screen to set a ICC profile at 50% yellow?
Therefore I wonder which concept is right, 50% + 14% (allowed TVI) + 7.41% = 71.41% or 50% + 7.41% = 57.41%.

 

[gordo]

From the printed sheet and reported by QuadTech CCS system. A table is shown us the figure at 50% yellow color is -7.41%. So I need someone tell us the real % of the half tone. The -7.41% is guided us how many % screen to set a ICC profile at 50% yellow?
Therefore I wonder which concept is right, 50% + 14% (allowed TVI) + 7.41% = 71.41% or 50% + 7.41% = 57.41%.

I'm just guessing, so I might be completely wrong - but it sounds like your system has a target dot gain and is reporting that your yellow is too low by 7.41%.

It also seems that you are somehow mixing ICC profiles with TVI. But maybe I just don't understand your problem.

I'm not sure what you are doing, but here are the solid ink density values and dot gains for GRACoL 6 type 1 paper which is what you said you were trying to do.

K: 1.70/20%
C: 1.40/16%
M: 1.50/16%
Y: 1.05/15%

best, gordo

 

[THYum]

Hi Gordo
Let say, if the GRACoL 6 is given us a standard 15% for yellow color. Our printed target is 65% instead of 50% yellow color

 

[gordo]

Hi Gordo
Let say, if the GRACoL 6 is given us a standard 15% for yellow color. Our printed target is 65% instead of 50% yellow color

Yes....

best, gordo

 

[THYum]

So, what ever we set the dot in the 50% area the final result is measured by x-rite that must be 65%. Is this logical? Thanks.

 

[gordo]

So, what ever we set the dot in the 50% area the final result is measured by x-rite that must be 65%. Is this logical? Thanks.

Yes, you ask/specify 50% in the file and you should measure 65% in the presswork.

gordo

 

[THYum]

Thanks Gordo, may I ask you another funny question.
Do you know what is "P2P" chart?
Somebody told me that the figure is shown positive (2.47%) through P2P chart which means the printing machine is no dot gain. Does he right?

 

[gordo]

Thanks Gordo, may I ask you another funny question.
Do you know what is "P2P" chart?
Somebody told me that the figure is shown positive (2.47%) through P2P chart which means the printing machine is no dot gain. Does he right?

The P2P reference chart is a set of near-neutral CMY and K values using the G7 grey balance method.
Dot gain values are not important. What is important are final tone values in the presswork - whatever the dot gain is.

best gordo

 

[rich apollo]

Attached is a copy of the P2P target.