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Rendering intent
Rendering intent is the mapping strategy used to convert color spaces.= p>
In general, when creating ink-optimizing DeviceLinks:
Total ink limit
Total ink limit (TIL) is a restriction on the maximum amount of ink allo= wed at one time during four-color printing. For example, if you allow 100% = of all four inks to print at one time, this would be specified as 400= % TIL and would result in 400% ink coverage.
It recommended that you use the default TIL values. The default TIL valu= es are aligned with what the device is capable of for a given print conditi= on. If you decrease the TIL values below normal operating conditions, ink s= avings may not occur.
For this device condition |
Use this TIL range |
---|---|
Heated web offset press printing on coated pa= per |
280=E2=80=93300% |
Newspaper web offset press printing on uncoat= ed paper |
240% |
Sheetfed offset press printing on coated pape= r |
320=E2=80=93350% |
Black Start
The recommended Black Start value = is between 10 and 25.
Maximum Black
Maximum black is the highest amount of black that can be introduced to a=
color build. Typical values for maximum black are between 90% and 100%. Ho=
wever, because of the increased use of black in the ink-optimized separatio=
n, you may want to set Maximum Black to 100%.
Black strength
Black strength sets the level of available black in a color build.
Lower levels of black strength retain a corresponding amount of CMY in t= he color build. For an average printing condition, set the black strength t= o a value between 75% and 85%. If your process is under tight control, it i= s possible to use a Black Strength value higher than 85% and achieve a grea= ter ink savings.
To run high levels of black strength, black ink must be printed at the d= ensity at which it was characterized. It is common to characterize black at= a density of 1.8 and print it at 2.0 or higher, for work that contains ima= ges and text. With high levels of black strength, printing a higher density= than is characterized darkens images and reduces chroma (also known as a = =E2=80=9Cmuddy=E2=80=9D look). To avoid this, maintain process control so t= hat the density and TVI values of the production run match very closely wit= h the density and TVI values of the characterization run.
Target Simulation and Co= lor Space Conversion check boxes
Select these check boxes to change the output color t= o more closely match the source space that is defined.
For this scenario |
Do this |
---|---|
You have defined an offset press device condi= tion for a PCO and have created gray-balanced curves to simulate a target. = You want to apply ink savings to this condition on output without changing = the simulation color to press |
Select the = DeviceLink method type as= Ink Optimizing Solution, and clear the Target Simulation check box. This Devi= ceLink does not change the overall color and provides ink savings |
You have defined an offset press device condi= tion for a PCO and have created gray-balanced curves to simulate a target. = You want better alignment to your source target=E2=80=94for example, better= blue sky |
Select the = DeviceLink method type as Ink Optimizing Solution, and select the Target Sim= ulation check box. |
You have defined an offset press device condi= tion for a PCO and have created gray-balanced curves and a DeviceLink. You = would like to take advantage of the Ink Optimization feature |
Select the = DeviceLink method type as Ink Optimizing Solution, and select the Target Sim= ulation check box. |
The same principle applies in the context of an SCO. However, with an SC= O, you are managing the conversion rather than the simulation. Consequently= , when you select the Color Space Conversion check box, the source= space is the color response of the PCO.