This process template section defines how Prinergy handles color converting during CT/LW output to a Karat digital device.
Color converting transforms the color description of colored objects in a CT/LW page to the appropriate final output color space, and then to the appropriate color space of the Karat digital device. As a result, the CT/LW output simulates the intended final output.
Output to
The box contains CTLW Karat; you cannot change this information.
JTP
Select the job ticket processor (JTP) to use for color conversion.
You set up JTPs using Prinergy Administrator.
Match Colors
Match Colors in Page Content
Enables the Color Matcher to match hues in the page content for proofing. Select this check box to enable this feature; clear the check box to disable this feature.
When you enable this feature, you can set the Assumed Source or DeviceLink Profile and the Rendering Intent options.
Assumed Source or DeviceLink Profile
Select Exactly as Applied During Refining to use the same profile that was used during the refine process. If the file was not color converted during refining, or the profile is missing, an error is displayed.
Select As Defined Below, if Not Set in Refining to use the same profile that was used during the refine process, if the file was color converted during refining. If the file was not color converted during refining, the profile defined in the Input Device Conditions box will be used.
Select Exactly as Defined Below to use the profile selected in the Input Device Conditions box.
Input Device Conditions
Available when Assumed Source or DeviceLink Profile is set to As Defined Below, if not set in Refining or Exactly as Defined Below.
From the list, select Browse to locate the appropriate profile file for final output.
Rendering Intent
Select Relative Colorimetric if the proofing paper is similar to the paper that will be used during final output.
Select Absolute Colorimetric to simulate the color of the paper that will be used during final output.
Select PDF to use the rendering intent specified in the PDF file when output by the creative software during final output.
Select Perceptual to use rendering that uses gamut compression and produces less saturated colors during final output.
Select Saturation to make sure colors are represented in a way that preserves or emphasizes saturation during final output.
Retain CMYK Black
Preserves black in images and graphics that are defined in CMYK or RGB color space. For ICC-based color matching engines, CMYK images and graphics get transformed from CMYK to L*a*b* and back to CMYK color in order to perform color matching. In going from CMYK (four components) to L*a*b* (three components) and back again, the black (K) channel separation information (UCR/GCR) has in the past been destroyed. Selecting this check box instructs the Color Matcher to preserve the black generation information from the source color space. As a result, the amount of black relative to CMY in the images and graphics stays about the same. The purpose of this feature is to help preserve the visual weight of images and graphics.
Note: When you enable this feature, Color Matcher requires some additional processing time because of the extra calculations involved.
Overprint Handling (CPU Intensive)
(See About overprint handling)
Select to prevent overprinting objects from generating unintended knockouts.
If you are converting spots to process for a proof, or if you are color-matching one CMYK space to another CMYK space for a proof, you probably need to apply overprint handling, even if you applied it during refine.
To use overprint handling, you must perform these actions:
- In the ColorConvert section, select:
- The Color Matcher JTP
- The Match Colors in Page Content check box
- The Overprint Handling check box
- Choose between raster and vector overprint handling in the Methods list.
- In the ColorConvert section, select:
Note: The raster option is available only when Shades=256 is selected in the Render section of the process template.
Method
Choose to use vector or raster overprint handling for this output process.
Select Raster when outputting to low-resolution contone proofers (for example, Veris digital proofer or Matchprint Inkjet proofer).
Note: To use raster overprint handling, in the Render section of the process template, you must select Shades=256.
Additional factors to consider:
- Raster overprint handling can be applied only to continuous tone data
- Raster overprint handling occurs after the RIP
- Raster processing time increases exponentially as the resolution increases
- Raster overprint handling eliminates all overprints
Select Vector when outputting to halftone (screen) proofers (for example, the Spectrum device), or to high-resolution contone proofers.
Additional factors to consider:
- Vector overprint handling occurs before the RIP
- Depending on the complexity of the file, vector overprint handling could take longer than raster overprint handling.
- Vector overprint handling does not eliminate all overprints. In objects where overprinting does not have an effect on the output, the objects retain an overprint status. For example, if you set black to overprint, but one black object is not placed on top of another object, this black object is, after overprint handling, still an overprinting object.
Process CEPS Data
Select this check box to enable spot color mapping and color matching of CEPS data.
For more information, see the CEPS Conversion section of the refine process template and Normalize section of the refine process template topics.
Process Marks
Select this check box when you want to apply color management to your marks file. Depending on the type of mark, it may be necessary to enable Overprint Handling to appropriately convert the mark and apply the necessary color transformation.
Note: When Process Marks is checked, both sheet marks and page marks are color managed.
Color match 1-bit images
Select this check box to color match 1-bit images. One-bit images are images that represent two tones, typically black and white. The pixel is either a 0 or a 1 value. Examples are copydot images.
Note: This feature will convert 1-bit images to 8-bit images. This causes pages to become larger and to render more slowly. Turn off this feature if you do not require color matching of 1-bit images, or if the feature causes unacceptable performance degradation. (For example, copydot files take a very long time to refine and render.)
This feature is available when Match Colors in Page Content is selected.
Preserve Colors
Preserve White and Black Colors for Graphics
When this option is selected, the Color Matcher JTP bypasses pure white and pure black. For example, if an input file has a build of 0,0,0,100, Color Matcher does not touch the input build of pure black, for graphics only. Similarly, for pure white, if an input file has a CMYK build of 0,0,0,0, Color Matcher does not touch the input build of pure white. The following builds are also preserved:
- 255,255,255 RGB
- 0,0,0 RGB
- 255 Gray
- 0 Gray
Preserve Any CMYK Pure Black for Graphics
When this option is selected, Color Matcher bypasses all CMYK (0, 0, 0, 0...100) colors. The options are available regardless of whether ColorFlow is used. The options are also unrelated to the use of a DeviceLink profile.
Device Condition
Enables the ICC profile, which characterizes the way the Karat device prints.
Select a path to the ICC profile, or select Browse to locate the profile.
Source of Color Recipes
Extract Recipe from the File
Select to use the color recipes embedded in the file.
Lookup Recipe in Color Database
Select to use the color libraries selected in this process template.
Color Libraries
From the Selectable list, select the color libraries you want Prinergy to search for color recipes, and click Add.
Arrange the color libraries in the Selected list in the order that you want Prinergy to search. Use the Move Up and Move Down buttons.
Note: Ensure that you select color libraries with color spaces that are compatible with the Proof Process Profile.
Use Recipe from File if not found in Color Database
Select this check box to use color recipes embedded in the file if Prinergy does not find the colors in the selected color libraries.