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The ColorConvert section of the refine process template defines how Prinergy handles overprints and uses ICC profiles and ColorFlow device conditions to transform color data from the input color space to the output color space. About ICC profiles and color managementAn ICC device profile is a standard color space description, defined by the International Color Consortium (ICC), that facilitates conversion of color data among color capture and reproduction devices. For example, an ICC device profile that describes a specific RGB device, such as a digital camera, provides a mapping of the camera's red, green, and blue color coordinates to device-independent L*a*b* coordinates, called the CIELAB color space. Color conversion using ICC profiles typically uses two device profiles. The source profile represents the origin of the color data, or its initially intended reproduction device. The destination profile represents an (alternate) reproduction device selected for output. Color data is converted using both profiles, and a rendering intent that defines how source color coordinates are mapped to destination color coordinates. An alternative is to use an ICC DeviceLink profile for conversion from source to destination color space. A DeviceLink encapsulates relevant portions of the source and destination profiles, and the rendering intent. DeviceLinks offer some benefits in processing speed and preservation of black ink usage in CMYK-to-CMYK conversions. Prinergy stores ICC profiles in For new Refine process templates, the default behavior is to convert RGB images and graphics to CMYK. The default source profile is You should change the Primary Color Output profile to a profile which most closely represents your target print condition. Prinergy supplies a variety of standard profiles for a range of print conditions, but you should consider using ColorFlow Pro Workflow Edition to characterize your specific print condition and create an ICC profile which exactly represents your print condition, and will result in the most accurate conversion of spot colors, images and graphics for reproduction on your print device. For more information, see the Using ColorFlow software topic in the Color chapter. JTP Select the JTP (job ticket processor) to use for color conversion. For converting colors, use the Color Matcher JTP. Overprint ConversionSelect to perform automatic conversion of overprints. Set CMYK Colors to Knockout Select this check box to override the overprint setting in the input file and force CMYK process colors to knockout. As a result, color printing order affects which separations are knocked out, including spot colors. Set Spot Colors to Select this check box to override the overprint settings in the input file and force spot colors to either overprint or knockout. Then, select one of the following two options:
Set Black to Overprint when Black is ___ % or higher Select this check box to overprint pure black objects (that is, K=1–100% and CMY=0%) when the black tint equals or is greater than the value that you specify in the adjacent box. For example, if an input file contains a black object with 75% black and you type Set Rich Black to Overprint Note: The Set Rich Black to Overprint check box is available only when the Color Matcher JTP is used. Set Overprint CMYK White to Knock Out Select this check box to knock out all white objects. Enable Gray Overprint Note: The Enable Gray Overprint check box is available only when the Color Matcher JTP is used. Change Overprint Mode Select this check box to convert the overprint mode from OPM 0 to OPM 1. Treat pure gray RGB as gray Select this check box to convert pure gray RGB to a black-only process color. Pure gray RGB is defined as any gray that is created by equal values of red, green, and blue—for example, R=23, G=23, B=23. Treat shading as Use this option for color-matching shadings. By default, this option is set to Image, because Prinergy typically treats shading objects as images. When an input file doesn't define a source profile for shading, Prinergy uses the source profile from the image. Select Graphic for PDF pages with shading and gradients that look similar, when you want shading and gradients to appear the same after color matching. Process CEPS Data Select this check box to specify spot color mapping and color matching of CEPS data. Color match 1-bit images Select this check box to color match 1-bit images. 1-bit images are images that represent two tones, typically black and white. The pixel is either a 0 or 1 value. Examples are copydot images. Overprint HandlingOverprint Handling (CPU Intensive) Select this check box to use vector overprint handling, which prevents overprinted objects from generating unintended knockouts, including on objects printed on a transparency stock. Final Output Resolution Type the resolution that is suitable for the intended output device. Preserve Traps Select this check box to preserve existing Kodak traps when vector overprint handling is used. Extended Blend Mode Handling (use with caution) This option is only available when the Overprint Handling (CPU Intensive) check box is selected. If you select this option, additional Transparency Blend Modes (ColorDodge, ColorBurn, Difference, Exclusion, Lighten, Darken and Screen) will be processed through the Overprint handler (if necessary). This option is to be used with caution (check output carefully) since colormatching transparency can cause unexpected results (for more information, see the Color Convert section of the Release Notes). Note: In Prinergy 6.0, 6.1 and 7.0, this functionality was enabled whenever Overprint Handling (CPU Intensive) was selected. In Prinergy 7.5, you can decide whether to enable it or not. Match ColorsThe Color Matcher JTP handles color management in Prinergy. It performs the following functions:
Prinergy is shipped with standard RGB and CMYK ICC profiles for conversion of RGB images and graphics to CMYK when other profiles are not provided. For CMYK‑to‑CMYK color matching, the Color Matcher JTP uses ICC profiles to transform the color space of CMYK objects in the PDF file to a color space that is appropriate for the intended output print condition. When color matching is selected during the refine process, color data is matched to a Primary Color Output, which serves as the destination of color conversions. The Primary Color Output generally represents an established print condition on a specific output device, or a industry print specification. You should change the Primary Color Output profile to a profile which most closely represents your target print condition. Prinergy supplies a variety of standard profiles for a range of print conditions, but you should consider using ColorFlow Pro Workflow to characterize your specific print condition and create an ICC profile which exactly represents your print condition, and will result in the most accurate conversion of spot colors, images and graphics for reproduction on your print device. Enable ColorFlow Select this check box to use the ColorFlow software, which provides color relationship management that unifies all color elements (such as ICC profiles and curves) and manages the relationship between them and the device print conditions. When you select Enable ColorFlow, the adjacent Snapshot and Color Setup lists become available. Snapshot A ColorFlow snapshot captures the state of the entire color database, making its elements available to the workflow and providing a convenient backup. The snapshot feature enables you to isolate experimentation, adjustments and testing in ColorFlow from Prinergy production Refine processing. At any time, you can roll back (revert) to the state of a previous snapshot in the ColorFlow software. If you revert to a previous snapshot, ColorFlow deletes all color database changes that were made after that snapshot was captured. When you have completed your work in ColorFlow to a certain level and you are satisfied with the elements in color setups, you will mark a snapshot as approved. Refine using the Approved snapshot is recommended for production jobs. The default Snapshot selection for new process templates is Approved. Only one snapshot can be in the approved state at any time. This list is available only if Enable ColorFlow is selected. Color Setup A color setup is a collection of device conditions and the color control elements (curves, device profiles, and DeviceLink profiles) that are required to process color data with consistency among color capture and reproduction devices. This list displays the names of all color setups in the selected snapshot for which Show in Prinergy is selected in ColorFlow. At the top of the list are Job color setup and Select by PDF/X Output Intent.
If you select a specific color setup, that color setup provides ICC profiles for converting color data. If you select Job color setup, the color setup selected in the Job Color Setup list in the Edit Job Attributes dialog box provides ICC profiles. If you select the Select by PDF/X Output Intent option, the color setup, whose PCO profile matches the PDF/X Output Intent profile of the PDF file, provides ICC profiles. Note: If you refine multiple PDF/X files with different output intents, a different color setup will be selected for each file. WARNING: If you select Job color setup, and the Job Color Setup selection is None, the Refine process will fail. WARNING: If you select Select by PDF/X Output Intent, the Refine process will fail in the following cases:
This list is available only if Enable ColorFlow is selected. Show only PDF/X Output Intent color setups When this check box is selected, the Color Setup list displays only the names of color setups whose PCO is a PDF/X Output intent. 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:
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. Tagged Content This section controls how the Color Matcher JTP processes content that is tagged with an embedded ICC profile. You can choose from two processing modes for each of four element types: CYMK Images, CMYK Graphics, RGB Images, and RGB Graphics. Images refers to raster image data, and Graphics refers to vector data.
These selections have no effect on PDF pages that do not have embedded ICC profiles. Untagged Content This section controls how the Color Matcher JTP processes content that is not tagged with an embedded ICC profile. You can control processing for each of four element types: CYMK Images, CMYK Graphics, RGB Images, and RGB Graphics. Images refers to raster image data, and Graphics refers to vector data. This section also controls processing of tagged content, if Strip embedded profiles and process as Untagged Content is selected for the same content type.
Primary Color Output Specify the ICC profile that objects to be color-matched will use for final output. Notes:
Prefer embedded Output Intents for Final Primary Color Output Profile If your input file is PDF/X-3 or PDF/X-4contains an Output Intent, and you want to use the color profile specified in the PDF/X output intent, select the the Prefer embedded Output Intents for Final Primary Color Output Profile check check box. If you want to retain the Output Intent in the PDF Subpage, be sure to select ColorConvert and Spot Color Mapping Destination profile in the Normalize section of the Refine Process Template Retain CMYK Black In Select this check box to preserve black in images and graphics that are defined in the CMYK color space. Notes:
CMYK Images Select this check box to preserve the black channel information when CMYK images are transformed from CMYK to L*a*b* and back to CMYK. CMYK Graphics Select this check box to preserve the black channel information when CMYK graphics are transformed from CMYK to L*a*b* and back to CMYK. Rendering Intent Select a colorimetric rendering intent for the selected object types:
Select Relative to turn off gamut compression and retain color saturation for the selected object types. Reset to Defaults Select to return all options to the default (factory-set) values. |
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