ZePrA | Spot Color Iteration (ZePrA 9 and higher)

Spot Color Iteration

Iterate spot colors to improve or maintain quality

Iterate Spot Colors

Spot Color Iteration is a process that involves printing of the spot colors converted from ZePrA on the printer to be used for the print job, followed by measuring test charts and optimizing the color differences (expressed in deltaE2000) until the measured deltaE values are within the desired tolerances. Printing the test chart and applying the Iterate Spot Colors feature once only already results in an improved spot color rendering which is usually close to the optimum of this printer.

Why can spot color iteration be required?

First of all, be assured that ZePrA already calculates the best possible spot color conversion based on the target profile set under Configuration/Target Color Space. However, printers, inks and papers drift over time so that there are always some deviations from the state the printer was profiled. During spot color iteration we measure how converted spot colors are actually printed in the current state, and subsequently optimize the deltaE2000 values. The iteration report shows which colors are improved and where restrictions based on the color gamut or the spot color Calculation Method occur so they can’t be optimized further or if additional iteration steps are recommendable.

Procedure

Open the Spot Color Iteration Wizard, either from:

  1. The Spot Colors tab under Configurations (Configurations > Spot Colors > Iterate at the bottom of the window).

  2. The Tools menu (Tools > Spot Color Iteration).

  3. Alternatively, if a job with spot colors has been converted via a queue and the associated configuration is set to Convert Spot Colors, the Spot Color Iteration Wizard can be started by right-clicking on this job in the Processed Jobs section of the Overview window and selecting Spot Color Iteration.

Note: A spot color module license is required to use the tool.

The Spot Color Iteration Wizard dialog consists of two tabs, the Current Iteration and the Archive tabs. The Current Iteration tab contains the actual iteration wizard and typically, if a configuration is selected that has not yet been iterated, the wizard is started directly there. The Archive tab contains all the iteration steps that have been carried out, including all the evaluation details.

The wizard guides the user through the iteration process in seven steps:

Step 1: First, select the Configuration you would like to use for printing. The option Convert Spot Colors must be enabled in this configuration.

Notes: When the Spot Color Iteration Wizard is started via Processed Jobs of the Overview, the Configuration is already preselected.
The best approach for the iteration of spot colors is to set the Calculation Method to Precise Match or Visual Match in the respective Configuration.
The setting Use the least Amount of Channels may be insufficient for iterating spot colors. Importantly, spot color iteration will not work when the spot color conversion is set to Convert using Alternate Color Space from PDF.

Step 2: Select the source of the spot colors you would like to optimize. You can either choose a PDF or Image File with spot colors or an entire spot color Library.

Note: When the Spot Color Iteration Wizard is started via Processed Jobs of the Overview, the Job (PDF or image file) is already preselected.

Step 3: Select one or more spot colors for iteration. All spot colors of the job, PDF or image file will be automatically extracted and displayed. Disable the colors that are not to be iterated. By default all spot colors are preselected.

Step 4: Choose to Create a Test Chart or to measure the full tones of spot colors from an existing print (Don’t create Test Chart).
Create a Test Chart: Creates a test chart with the spot colors selected in the previous step. Select an Instrument Setting and click on Save to enable the Continue button.

Don’t create Test Chart: Some prints contain control patches of spot colors that can be used for measuring. Larger areas in the design that contain the 100% tone of a spot color can also be used.

Note: The test chart contains the converted spot colors as given in the Configuration using the conversion settings and Calculation Method defined in the tab Spot Colors.

Step 5: Measure the printed spot colors. When using the test chart, it must be printed on the printer without any color management and can be measured after drying.
Measure: Starts the Measure Tool. You do not need to worry about the reference file and layout, as this is already preselected within the Measure Tool. Instructions on how to select your device and make measurements can be found under Measure.

Load: If you have created a test chart you can use the associated exported reference file and measure your printed chart with a different measurement tool. Make sure that the measurements are saved in standard file formats that can be read by ZePrA, such as CGATS TXT, XML or CXF3. The external measurement files can be loaded using the Load button.

Once the measurement data has been transmitted from Measure Tool or loaded from external sources, and it conforms to the printed chart which is indicated by a green check mark, you can proceed by clicking Continue.

Note: When loading measurement data that does not match the chart layout or the corresponding patches in the reference file, you are alerted by a warning message and cannot proceed to the next step.

Step 6: The evaluation results of the measurements of each spot color are displayed in comparison to the reference Lab values of the original spot colors. In addition to the DeltaE2000 (dE00) and DeltaE76 values, a Status information text is also displayed, either in green, yellow or orange. The Legend below the table explains the indication colors and status information.

Green: The spot color match is less than 1 dE00 and a perfect match is achieved. Further optimization is then no longer required. 

Yellow: The spot color match is less than 2 dE00 but higher than 1 dE00 and the Status column indicates that the match can further be improved.

Orange:  The spot color has a higher deviation than 2 dE00 and the Status column indicates that the match can further be improved.

If a color is not optimizable or out-of-gamut, it can not be improved which is indicated in the Status information column, too.

ZePrA preselects one of the two options (Apply Optimization or Don’t apply Optimization) depending on the evaluation results. However, the preselection can be overridden and another iteration cycle can be applied if the results are to be improved even further. To do this, select the Apply Optimization radio button and click Continue. Alternatively, if you just need the measurements for evaluation select the Don’t apply Optimization radio button.

Step 7: The concluding step of the iteration cycle contains three options and a checkbox to choose from. Based on the previous results, the wizard already preselects a logical option for you to follow:

  1. Optimize Spot Colors again: Runs another iteration cycle, for example, to check whether a previously iterated spot color successfully passes the evaluation. If you select this radio button and click Continue, a new iteration cycle starts with step 1 and the selection of the spot colors to be optimized.
  2. View the evaluation results in the Archive tab: If you have already completed several iterations or would like to see the evaluation results once more, select this option. When you click Continue, the Archive tab opens.
  3. Close this dialog: If the evaluation results are fine or if you want to end the iteration process you can simply select Close this dialog and by clicking Continue the iteration is ended. 

The checkbox Repeat Job works independently from the three radio buttons. If it is enabled when clicking Continue the last job is converted again with the configuration. This is especially helpful if the spot colors of that last job have been optimized by the wizard which in turn optimizes the spot color settings in the configuration to improve the spot color rendering. 

You will find the optimized device values (Output values) in the table of the tab Spot Colors under Configuration. They will be marked as Iterated in the column Information of the table. 

Archive

All data created during the iteration – such as test charts, reference data and measurement data, as well as the report – are stored in an internal database in addition to the save location defined by the user.

Therefore, if data is deleted from the save location it can still be restored from the internal database any time via the Archive tab. Users can stop an iteration process and even close the Spot Color Iteration Wizard dialog at any time and can revert back to the last completed step with the help of the information stored in the Archive.

The Archive tab shows all iteration steps and evaluation details. The History table contains a list of all iterations. More information for the selected iteration step is displayed under Details.

The columns of the History table show the iteration step number #, the maximum DeltaE00 value dE00 (max), the average DeltaE00 value dE00 (avg), the Status of the selected iteration step. It also shows some Information about the iteration process itself, such as Optimization applied, when the measurements done from the printed test chart have actually been used to iterate a spot color, or Evaluation measurement, when the measurements have been used for evaluation only and have not been used to iterate a spot color.

In addition, the iteration process (being performed in the Current Iteration tab) can be discontinued, which is indicated with various messages such as Next step: save chart, Next step: measure or load data, Next step: Evaluate.

Right clicking on an iteration step in the History displays a context menu with the following options:

Save Chart: Exports the test chart into a file selected by the user. The test chart is not newly created but only copied from the internal database. This implies that the file selection only supports the file type initially chosen by the user.

Save Reference Data: Exports the reference data that belongs to the test chart into a file selected by the user.

Save Measurement Data: Exports the measurement data into a file selected by the user.

Save Report: Saves a report containing all Details displayed on the right and the full information about each spot color. This is useful to identify colors with the highest or lowest deltaE values, or colors which are out of gamut. The report is explained in more detail below.

Revert to state before: This is only available for iterations with the status applied. Reverts back to the state before this iteration, giving the previous iteration, if any, the applied state. The status changes to evaluation measurement. All subsequent items are deleted.

Revert to state after: This is only available for iterations with the status applied. Proceeds to the state after this iteration step, making it the active iteration. The status of a next iteration, if available, would be evaluation measurement. All subsequent items after the next iteration are deleted.

Apply Optimization: This is only available for iterations with the status evaluation measurement. It can be used for evaluation measurements that have not been applied in the iteration process itself. Use this option if you want to apply an iteration later on.

Evaluation Results

The Evaluation Results shown under Details are always the evaluations of the previous step. This means, if an iteration has been applied in step 1, the evaluation results shown under Details for the selected step 1 are the values before the iteration has actually been applied. Therefore, in order to see the results of the first iteration a second step is necessary. The evaluation results shown for that second step are actually the iteration results of the first iteration step, and so on. This offers the possibility to use the results of an iteration itself for a second iteration. But again, another measurement step is needed to find out if this iteration actually improved the result.

The Report

By right-clicking on an iteration step in the left table, a report can be created for this step which can be saved in various formats such as PDF, HTML, XML and TXT. The PDF and HTML formats are the most common versions for end users, while the other formats are more intended for automation and usage in other systems such as a MIS (Management Information System). The following is a description of the PDF report.

The Report contains all information about the spot color Name, the device values generated by ZePrA (displayed in the color space of the target profile) and the measured Lab values as well as the dE2000 and dE76 deviations from the reference Lab values of the spot color and the Status. Under Status it is displayed whether the respective spot color has been well matched (less than 1 deltaE2000) and whether it can still be optimized. If the match of a spot color is smaller than 2 dE00 but larger than 1 dE00 and the match can be further improved, then it is displayed in yellow in the Status column. Finally, spot colors with a deviation higher than 2 dE00 will be highlighted in orange. If a color cannot be optimized or is out-of-gamut, it cannot be improved, which is also displayed in the Status information. The Legend below the table explains additional information messages that can be displayed.

ColorAnt | Evaluate

Evaluate - Proof Evaluation

Evaluation of Proof Measurement Data

Evaluate – Proof Evaluation

Evaluate can be used to check whether the proof measurement data from a media wedge fulfills the requirements for a contract proof according to ISO 12647-7 or a validation print according to ISO 12647-8. A fully-detailed report can be created with a pass/fail indicator.

Note: The Proof Evaluate tool supports all color spaces including Multicolor and spot colors. It is a powerful addition to the proofing feature introduced in ZePrA 8, as it allows you to use the reference files of the dynamic media wedges created by ZePrA for proof evaluation.

The Evaluation tab immediately shows the categories related to the chosen standard, the deltas to the reference, and a score with either a ✓ (passed) or an ✕(failed).

An overall score indicates if the proof has passed or failed.

There are two ways of selecting your reference:  

  • Choose reference data: This drop-down menu contains all data loaded under Data Sets that fit the selected proof measurement data as a reference, which means the number of patches and the color space must match. Select the reference that you want to compare with the selected media wedge measurement data. If dynamic media wedges were used in ZePrA, the corresponding reference data can be used for the proof evaluation in ColorAnt.

    Using reference data from ZePrA:
    1. Open the reference file of the ZePrA configuration in ColorAnt. It is located in ZePrA’s Report folder of the corresponding queue.
    2. Select Measure to measure the media wedge in the proof printout
    3. Open the resulting measurement file and click the Evaluate button.
    4. Select the original reference file from ZePrA under Choose reference data in the Proof Evaluation window.
     
  • Choose reference ICC profile: This drop-down menu contains all ICC profiles that fit the selected proof measurement data as reference in terms of the same color space. Choose the reference ICC profile that you want to compare with the selected media wedge measurement data.
    Note: The ICC profile is used to create virtual reference values. Depending on the accuracy of the ICC profile, the quality of the reference data can vary from very exact (e.g. CMYK profiles created by CoPrA) to less exact (e.g. small Multicolor profiles).  

Evaluation method: Select a method to either evaluate a Contract Proof according to the ISO 12647-7 standard or a Validation Print according to the ISO 12647-8 standard.

ISO 12647-7: For the evaluation of a binding contract proof use this method. 

ISO 12647-8: Checks the conformance of printing systems that produces a hard-copy validation print, directly from digital data, which is intended to simulate the expected appearance of material printed per a characterized printing condition.

Note: Recently, other visualizations of the final printed product have found a place in the printing/proofing workflow because designers and print buyers prefer not to go to the expense of using an ISO 12647-7 compliant contract proof any earlier in the process than necessary. In many situations, participants in the workflow require a hardcopy visual reference of lesser quality than a contract proof. In the past, those prints varied widely in quality and were often referred to as design proofs, concept proofs, layout prints, etc. That quality level is here being referred to as a validation print.

Report

The available input fields depend on the selected Evaluation method. Enter the required information according to the selected ISO standard.

Save Report: Choose the file location and the format for the report (PDF, HTML, XML).

The report contains all the information that you have entered, the summary from the evaluation dialog, a list of all patches with their names or IDs, the device color space, the Lab reference values, the Lab measurement value and the delta.

Video Tutorial

How to Use the Proof Evaluation Tool in ColorAnt in combination with ZePrA

Learn step-by-step how to use the Proof Evaluation tool in ColorAnt for the evaluation of a proofing media wedge created with ZePrA. In this example, we will be demonstrating the special feature of ZePrA to create a dynamic media wedge using process and spot colors and how to use the supplied reference data from ZePrA for evaluation of a Contract Proof.

ZePrA | Apply Photoshop color corrections to PDF files

Apply Photoshop color corrections to PDF files

In some applications it is not possible to use measurement based DeviceLink profiles. This is true, for example, if a customer brings print data and a print that should be as accurate as possible in the production run without a correct proof. If you view the print data on a monitor with a soft proof of the print standard for the production run, clear deviations from the print that you have brought with you can become visible.

In this case you could either print outside the standard and try to recreate the default – either by making gradation corrections in ZePrA or by using the capabilities of the printing press – or print inside the standard by applying Photoshop corrections to the PDF file. The latter has the advantage that you can proof the color-corrected data according to the standard and have it approved by the customer. This procedure requires an experienced Photoshop user and CoPrA’s Editing tool.

For a test with production data the demo version of the programs can also be used. To do this, meaningful objects must be combined from the existing PDF data into one file in Photoshop and combined with CoPrA’s test chart (EditTarget). This test file is then corrected under softproof conditions on the monitor. The edited image is imported into CoPrA and the corrections are taken into account in the created DeviceLink profile.

Then the DeviceLink profile can be used in ZePrA to correct the color of the original PDF data. If necessary, the corrections can be approved by the customer on a proof before printing. The printer can work as usual according to standard and reach the proof reliably.

The individual steps are described in detail in the chapter How to create DeviceLink profiles with edited charts in the CoPrA Help.

ZePrA | Proofing

Proofing

Color-consistent simulation of the printing result

Proofing

ZePrA’s sophisticated technology – e.g. the quality of DeviceLink and SmartLink profiles and the spot color rendering of its advanced spot color module – can be used for proofing as well. This is especially useful as many RIPs do not support CxF/X-4 data and SCTV calibration nor have a spectral color prediction model for spot color rendering.

The Proofing tab under Configuration contains all Media wedge settings and the Proofing Information label.

Media Wedges

Two types of media wedges can be used:

  1. Media Wedge in Simulation Color Space: Can be used to determine the accuracy of the proof. This media wedge is converted based on the color management setting defined in the various configuration tabs.
  2. Media Wedge in Proofer Color Space: Allows using a second media wedge that is not color managed. It must be in the color space of the proofer and can be used to determine the stability of the proof printer.

Choose a Media Wedge.The media wedge is added outside the document’s media box to verify the proof. This can either be a dynamic or an external media wedge.

Dynamic Media Wedge: Uses the color space information of the simulation color space and dynamically adds all spot colors of the documents to be processed. The required reference files for measuring the wedges are created on-the-fly by ZePrA. They will be saved in the Folder for Report and other Data folder of the proofing queue that has automatically been set up by the Auto Setup Wizard.

The reference files for dynamic media wedges contain both the device values (DCS values) and the target Lab values. The target Lab values are also calculated for the spot colors of the job and incorporated into the reference file in addition to the color values of the document color space. This is done according to the settings under Configurations > Options (solid tone only or gradation values as well) and Configurations > Spot Colors.

The measured values obtained can then be immediately compared to the target Lab values (e.g. in ColorAnt/Compare). Use these reference files in appropriate tools, such as ColorAnt’s Measure Tool, for measuring.

Note: Reference files are not created when the report folder Folder for Report and other Data is missing. If you convert a normal queue by enabling proofing, you must create this folder manually so that a reference file can be created. If this folder is missing, no reference file can be created.

Reference files are created for each job in the queue and named as follows:

Jobname_DynamicMediaWedgeReferenceSource
Jobname_DynamicMediaWedgeReferenceTarget

If dynamic media wedges are selected for source and target color spaces, two reference files for each job will be created.

Note: If the same job is run again, the reference file will be overwritten. This means that if the spot color patches are changed under Options, a modified reference file is saved, and any previous conversion with the reference file with a different number of patches is lost.
The use of spot colors for the dynamic media wedge can be defined under Options 

Media Wedge from File: Can be media wedges such as the FOGRA, UGRA, Idealliance* or other media wedges. For external media wedges, the corresponding reference file is required to measure the printed wedge. Measurements can be done with any proof evaluation software or with ColorAnt’s Measure Tool.

*The IDEAlliance ISO 12647-7 Control Wedge 2013 is included in ZePrA and available under /Users/Shared/ColorLogic/MediaWedges (Idealliance ISO 12647-7: 2013, 3-Row Digital Control Wedge ® is a registered trademark of the Idealliance).

Note: A separate ColorAnt license is required to use the measurement and comparison features.

Proofing Information: Enabling this checkbox will add text information which are in accordance with ISO 12647-7 such as information about the job, date and time, conversion settings and the software used. The information that will be added to the converted file can be verified and edited in the text field. For editing switch to Custom.

Position: The two media wedges and the proofing information label can be positioned independently on the converted document. For each of these 3 elements, the user can specify where it should be placed. Positioning options are: Automatic, Bottom Margin, Right Margin, Top Margin, Left Margin. The elements are placed outside the media box of the document according to this setting. This results in an enlarged media box in the converted document. Automatic is suggested as default settings for all 3 elements to make sure that they are placed together on the converted job.

Options: General settings and settings for Dynamic Media Wedges can be defined unter Options.

Media Wedge Options

General

Font Size: Defines the font size used for the proofing information label in points.

White Space: Allows the placement of margins on media wedges by entering a user-defined distance in mm. By default a white space of 15 mm is added. This ensures that enough white space is added on the left and right of the placed media wedges which some instruments need for correct measuring. The White Space margin applies both to external and dynamic media wedges.
Note: If the external media wedge already has a margin, we recommend entering 0 mm as White Space. As a rule of thumb the white space in millimeters for dynamic media wedges should be at least the size of the Patch Width. The white space of the Media Wedge in Simulation Color Space is color managed whereas the white space of the Media Wedge in Proofer Color Space is not.

Place on every page: For multi-page PDF files media wedges can be placed on each page. By disabling the checkbox media wedges will be placed on the first page of the PDF only.

Dynamic Media Wedges

Defines the Default Chart Width, the Patch Width and the Patch Height of the dynamic wedge.

Gap Size: To separate individual patches. Select the width in mm.

Patch Distribution: Defines the distribution of patches on the media wedge.

  • Randomize: Color patches are distributed randomly.
  • Normal: Color patches are distributed as specified in the reference file.
  • Sorted: Color patches are sorted from light to dark.

Patches per Spot Color: Defines whether spot colors are to be used in the dynamic media wedge and, if so, whether tints are to be used.

  • None: No spot color is added to the dynamic wedge.
  • Solid Tone: Only the solid tone of each spot color in the job is used in the dynamic wedge.
  • 3 Patches: Uses the following patches for each spot color: 100%, 70%, 40%.
  • 5 Patches: Uses the following patches for each spot color: 100%, 70%, 40%, 20%, 10%.

Exclude Colors from dynamic wedges: Spot colors are used in documents for various reasons besides printing purposes, e.g. to illustrate the DIE cut lines, or varnish, braille or other non printing elements. Obviously, those colors are not to be used in the dynamic media wedge. To avoid using them in media wedges, create a library (or more if needed) containing all spot colors to be excluded and select it (or them) from the list under Exclude Colors from dynamic wedges. This list contains all spot color libraries managed by ZePrA. Enable the checkboxes of only those libraries which contain the colors to be excluded.

The selected libraries containing the colors to be excluded are also applied to spot colors of external media wedges. Typically, if the Document Color Space is Multicolor, ZePrA assignes the channels of the Document Color Space to the channels of the media wedge. This is intended in most cases, e.g. if a 7C media wedge with generic channel names is used for a 7C Document Color Space in such a way that the channels are associated. However, this is not intended in case a spot color White is to be used as 5th channel and the 5th channel in the Multicolor profile of the Document Color Space is called Orange (for example). To retain the white spot colors an exclusion library which contains White as non-printing color can be selected.

Video Tutorial

How to Use the Proof Evaluation Tool in ColorAnt in combination with ZePrA

Learn step-by-step how to use the Proof Evaluation tool in ColorAnt for the evaluation of a proofing media wedge created with ZePrA. In this example, we will be demonstrating the special feature of ZePrA to create a dynamic media wedge using process and spot colors and how to use the supplied reference data from ZePrA for evaluation of a Contract Proof.

ZePrA | Troubleshooting

Troubleshooting

Detect and resolve errors

Overview

To prevent errors and problems when processing files, ZePrA checks configurations and hot folders as well as settings and licenses.

If errors or problems are detected, an error message appears in the lower left of the ZePrA window.

If you click on this message, the error is displayed. If several errors are detected, a list of all errors is displayed.

Another click on the corresponding message opens the Troubleshooting dialog, which lists possible solutions to the problem found, which can then be applied to resolve the error.

Causes of errors

Errors can occur, for example, if certain profiles (or spot color libraries) are used in a configuration without embedding them in the configuration, and this configuration is then transferred to a computer on which these profiles (or spot color libraries) are not available. It is then not possible to process files with this configuration.

But certain combinations in the settings can also cause problems.

ZePrA therefore checks:

  • Configurations
  • Settings
  • Hotfolder (all required folders must be available)
  • Profiles (all required profiles must be available on the computer)
  • Gradation curves (all required gradation curves must be available on the computer)
  • Licenses (all required licenses must be available on the computer, depending on the job this can be SmartLink, Multicolor, spot color or SaveInk licenses)
  • Spot color libraries (all required spot color libraries must be available on the computer)

Troubleshooting

In the Troubleshooting dialog, the identified problem is described and options for solving the problem are suggested.

Some problems can occur in multiple configurations and can be solved immediately for all affected configurations, for example, when using the Perceptual Rendering intent in combination with SmartLink.

Click on the message to open the Troubleshooting dialog. Here, by selecting the Solve the issue automatically checkbox, you can switch all affected configurations to Standard Compression without having to change each configuration individually.