CoPrA | DeviceLink Iterate

Iterate

Improve DeviceLink profiles

Iterate

Overview

An existing DeviceLink profile can be optimized based on measured color values by using a test chart of your choice (can be created with ColorAnt/Custom Chart, see video turorial below). The iteration​test chart needs to be converted from source to target profile using the original DeviceLink profile and printed on the target printer. The measured color values of the printed test chart are then used to improve the conversion in order to achieve lower color differences and a more accurate reproduction of the source color space. Based on the measured values, it is automatically determined whether the target values are reached (which are determined by the source and target profiles) and a correction is made for deviations. Iteration is therefore particularly useful in proofing situations with absolute or relative colorimetric rendering intents. Perceptive rendering intents can also be used as a special feature of DeviceLink iteration in CoPrA. The iteration calculates a new DeviceLink profile based on the original DeviceLink profile and the measured values. The new profile can be reinserted for iteration until the desired result is achieved.

Iteration for Proofing and Production Printing

Iteration is a great method to get the best possible match for proofing. Proofing uses absolute colorimetric rendering without color exceptions. However, in digital production printing, perceptual rendering methods and color exceptions are used to keep colors pure. Nevertheless, there might be an interest to optimize the colors by iteration measurements (Note: It is not always recommended to do so, especially as out-of-gamut colors cannot be optimized).

Using the Iterate tool, it is possible to iterate data for production printing while retaining exceptions during the iteration process. CoPrA recognizes exceptions and rendering settings from the selected reference DeviceLink profile and retains them (only if the selected DeviceLink is a ColorLogic profile). A checkbox is shown when exceptions are used. By default, the checkbox is enabled. 

Notes

  • Iterate requires a DeviceLink license.
  • The test chart must match the color space of the source profile. 
  • Out-of-gamut colors of the original color space can only be improved to a limited extent. 
  • In proofing situations, the gamut of the target color space ought to be larger than that of the source color space, which makes iteration particularly interesting for DeviceLink profiles in proofing applications.
  • Iterations cannot be repeated arbitrarily due to fluctuations in print output, print material and the reproducibility of measuring instruments. More than 2-3 iterations are usually not necessary and not recommended.
  • Only DeviceLink profiles whose source and target profiles are available and referenced in the DeviceLink profile can be iterated. A warning is issued if the required source and target profiles are missing.
  • Third-party DeviceLinks that reference the used source and target profiles can also be iterated.
  • DeviceLinks that use color Exceptions and perceptual rendering options (such as conversion and separation profiles) can be iterated as well, but it should be done with care and it can only be done for ColorLogic DeviceLink profiles.
    Iteration allows the target values to be reached more accurately, which can result in a loss of channel purity if no exception settings are retained. Perceptive rendering intents require an interpretation of the measurement data, which can lead to slight shifts during iteration.
  • With a DeviceLink and a Multicolor license Multicolor DeviceLinks can be iterated, too.

Procedure

Procedure

Procedure

  1. Select Iterate in the sidebar or DeviceLink Iteration in the Navigation menu.
  2. Select the DeviceLink profile that you would like to iterate from the drop-down menu. Make sure that both the source and target profiles used in the DeviceLink are available in the ICC profile folder of your operating system, as CoPrA needs those to calculate the iterated profile. 
  3. Convert the test chart to be used for iteration with the DeviceLink profile and print it on the printer using the same settings as for the profiling test chart for this printer. The test chart can be converted using CoPrA’s Image Conversion tool.
    
Note: Use a test chart that contains the colors you would like to optimize. Typically, test charts with few color patches will suffice, but those patches must reflect the colors to be optimized. Therefore, using large profiling test charts is not required. Instead of using large test charts, use charts that can also be used to update profiles (see ColorAnt/Custom Chart tool). The color space of the test chart must correspond to the color space of the source profile of the DeviceLink.
  4. Measure the printed test chart in ColorAnt, save the measurement data and open it in CoPrA’s Iterate tool, either via drag-and-drop or via the Load button. Alternatively, click Measure and measure the test chart with CoPrA’s integrated Measure Tool.
  5. Depending on the selected DeviceLink profile and its settings, the checkbox Use same Settings from DeviceLink including exceptions will be activated or grayed out. It is activated for ColorLogic DeviceLink profiles that use Exceptions. If the DeviceLink is not a CoPrA profile or if it does not use exceptions, – which should be the default setting for proofing, – the checkbox is grayed out.
    Note: If the checkbox Use same Settings from DeviceLink including exceptions is deactivated, then all Exceptions are deactivated in the iterated DeviceLink profile.
  6. If you disable the checkbox Use same Settings from DeviceLink including exceptions,  then all exceptions are disabled in the iterated DeviceLink profile.
  7. Click Next to get to the Save dialog Format, Size and Further processing.
    Notes:
    a) The Default Template uses an option to add the iteration count number to each iterated DeviceLink.
    b) Size: It is recommended to select Auto because size matters for iteration. The Auto feature ensures that the highest precision is always used when creating the iterated DeviceLink.
    c) The newly created DeviceLink will have a more accurate color rendering for most in-gamut colors compared to the original DeviceLink profile. You can now use it in exactly the same way as the original one or use it for further iterations..
  8. If you would like to further optimize the DeviceLink, proceed as described above. However, select the previously iterated DeviceLink instead of the original one. Now convert the original test chart with the iterated DeviceLink (do not take the already converted test chart from point 3!) and use the measurement data of this printout to calculate a further optimized DeviceLink profile.

Format, Size and Further Processing

In the last step of profile creation, assign a Name and choose the Format and Size of the profile (see screenshot).

Name: Type in a Name for the profile.

Templates: Allows to select and combine name components from a list of options and save them as custom templates. The last selected template is used when creating new profiles, so the naming of profiles is automated.
Available naming options depend on the current profile type and include Date, Date/Time, Measurement data file name, Source and Target profiles, Name of the current preset and others. Each name component can be added at a user-defined position under Template (the position is selected with the mouse pointer). The Example section below shows the resulting name. Additionally, user defined text can be added at any position within the Template field.

Format: Define the Format of your profile. An ICC format in accordance with specification v2 is recommended as basic setting however, the newer format ICC v4 can also be chosen. In this case, please ensure that your programs support this format.
Note: ColorLogic products handle and use ICC v4 profiles consistently and correctly.

Size: The setting Large is recommended. The size specifies the number of grid points in the profile and determines the amount of disk space required for the generated profile. Small profiles should only be used for test purposes. Very Large profiles can slow down further processing in subsequent programs. Additionally, some programs are not able to handle very large profiles.

Further processing

Create Profile Report (PDF): Recommended to activate. The PDF report provides an overview of the quality of the profile based on statistics, diagrams of gray balances, gradients and gamut representations as well as color separations of converted test files.

Save Preview Profile: Is only available in Multicolor printer profiling. By activating this checkbox an ICC preview profile will be created in addition to the printer profile. It can be used as a soft proof profile in Adobe Photoshop.
Notes: Preview profiles are only suitable for proofing purposes. Either a preview profile or a CMYK profile can be created in one profiling step, but not both.

Embed profiles: Physically incorporates the used source and target profiles into the DeviceLink. This function is tricky and only recommended if the DeviceLink has to be transferred to a computer which does not have the required source and target profiles. It was implemented mainly for use with certain RIPs which only accept DeviceLinks with embedded source and target profiles.

Save: Creates the printer profile and saves it in the folder Profiles (macOS) or Color (Windows), (macOS: /Users/Username/Library/ColorSync/Profiles, Windows: C:\\Windows\\System32\\spool\\drivers\\color). Demo and encrypted profiles will be saved in a different location only relevant for ColorLogic applications.

Note: CoPrA-SP profiles are stored in the ColorLogic subfolder Licensed-Profiles.

Verifying the optimization

Verifying the optimization

ColorAnt can be used to verify a successful optimization. First create a “Lab Reference” to compare the measured values of the printouts to the values of the DeviceLinks. Use the ICC Transformation tool to create the Lab reference values by using the device values of the original test chart and the source profile and rendering intent of the DeviceLink. These Lab reference values now serve as comparison values after each application of the iterated DeviceLinks on your test chart. Compare the measurements of the iteration with the “Lab Reference” using the Compare tool in ColorAnt. 

You will notice that in-gamut colors of the iterated DeviceLink are closer to the Lab reference than those of the original DeviceLink.

Video Tutorial: How to create a test chart for iteration

Video Tutorial: How to iterate

ZePrA | Push 2 ZePrA

Push-2-ZePrA

Process PSD files directly from Photoshop

What is Push-2-ZePrA ?

Push-2-ZePrA is an Adobe Photoshop extension that allows color converting an image file selected in Photoshop with ColorLogic’s color server ZePrA from Photoshop. Depending on the color server settings high quality color conversions with DeviceLink profiles will be performed leading to better color rendering of images than typical color conversion with Photoshop. Even spot colors can be converted if the selected ZePrA configuration is set up accordingly. The converted file will be opened up in Photoshop so that you do not need to leave Photoshop in order to get the best possible color converted images.

Push-2-ZePrA System Requirements
  • macOS X 10.9 and higher
  • Windows 7 and higher
  • Adobe Photoshop CC 2017 and higher.
  • ColorLogic ZePrA 7.x and higher – must be installed on the same computer where Photoshop is installed and a valid license for ZePrA must be used.
Installation
  1. Use the installer for macOS or Windows for your respective operating system.
  2. Close Photoshop before installation and follow the easy-to-use installer.
  3. Once installed, start Photoshop, go to Windows/Extension and select Push-2-ZePrA to open the extension.
  4. Default location installation: If ZePrA 7 has been installed at the default location on your computer and a valid license has been loaded in ZePrA, it is ready.
  5. Non-default installations: If the extension does not locate ZePrA application, a blue warning message will display underneath the Convert button. To find the ZePrA installation use the fly out menu of the extension and select ZePrA Path… Navigate to the ZePrA.app on macOS or zcmd.exe on Windows and select it. After that, you are ready to go.
Using Push-2-ZePrA
  1. Open up an image in Photoshop to be color converted.
  2. Click on the Push-2-ZePrA extension.
  3. Select a ZePrA Configuration from the drop down menu. The drop down list will show all the configurations set up in ZePrA.
  4. Choose a configuration that fits your requirements in terms of Target Color Space and Photoshop Layers retaining. This information is shown below the drop down menu and picked from the selected configuration.
  5. Click Convert.
  6. After a few seconds, the converted file will be opened up in Photoshop.
    Note: The converted file will be saved at the same location as the original file and the configuration name will be appended to the original file name.
  7. If the original file has been edited or copied in Photoshop without saving, a temporary file needs to be created from the extension and the converted file will be placed in a predefined output folder.
    This folder is typically located under $HOME/Documents/Push-2-ZePrA/Output. Via the fly out menu of the extension, you can open that folder (Open Output Folder…) or set the path to your own preferred folder (Set custom Output Folder…). This folder is only used for converted files that have not been saved in Photoshop before using the extension.
    Note: The Command Line Interface (CLI) from ZePrA is used for the conversion but not the ZePrA application itself. That means you won’t find any of the images that have been converted via the Push-2-ZePrA extension in the ZePrA Overview dialog or hot folders of the ZePrA application.
Best Practices

For image conversions, we recommend setting up Direct Color Conversion configurations in ZePrA with the help of the Auto Setup Wizard. With a direct conversion from the image color space to the Target Color Space, double conversions are avoided. It is not recommended to use a Normalize and Convert queue as this can lead to converting the image two times (a double conversion – from the image color space to the Document Color Space and then to the Target Color Space), which typically is not wanted for image conversions.

Selecting the Direct Color Conversion option

For any changes in terms of PSD or TIFF file layers handling, color conversion or spot color conversion, please adjust the appropriate ZePrA configuration in the ZePrA color server. The Push-2-ZePrA Photoshop extension uses the configurations, but editing configurations is not supported.

Error Handling

When working with the Push-2-ZePrA extension potential issues might happen:

    1. Select the proper file for conversion: When several images are open in Photoshop keep in mind that only the selected, active document will be converted with Push-2-ZePrA.
    2. Incomplete conversions: When clicking the Convert button it may take a few seconds until the image is converted. During processing, do not close the Push-2-ZePrA extension nor minimize Photoshop. This will immediately stop the conversion.
    3. Restricted folders and locations: A warning message appears when saving a file in a restricted location. Please keep in mind that the converted file will be saved at the same location as the original image file. If that location (folder) has write protection settings (e.g the applications folder of an operating system) a warning message appears.  The warning message offers the option to cancel the conversion or to save the converted file in the output folder (see point 7 above).
    4. Troubleshooting job warnings: An error message with the selected configuration appears. In such a situation, check the corresponding configuration in the ZePrA application and check for the cause of the error. It may be that the image file and the setting in the configuration do not match. In such a case, it is suggested to convert the image file in the ZePrA application with the same configuration used in the Push-2-ZePrA extension. The same job warning message may show in ZePrA. Troubleshoot the issue and change the settings in the ZePrA application, until the file conversion works as desired. Once the configuration has been saved in ZePrA go back to the Push-2-ZePrA extension, close it and reopen the extension to update the list of configurations and settings and convert the file in Photoshop again.
    5. Changes and updates to configurations: When changes or updates to ZePrA configurations have not been applied in the Push-2-ZePrA extension, make sure that the edits have been saved in ZePrA before heading to the Photoshop extension. Then close the extension and start it again so that it refreshes the list of configuration and their settings.
    6. Support for prior ZePrA versions: ZePrA versions prior to v7 are not supported. The extension may show the settings of configurations from older ZePrA versions, but will not convert files. We do not recommend selecting prior ZePrA versions with the extension and will not be supporting prior versions in future releases.
    7. Avoid special characters in configuration names: characters such as | < > * ? / \\ : in configurations names with ZePrA. While ZePrA will handle such characters the Push-2-ZePrA extension does not.

ZePrA | Job Warnings

Job Warnings

Customize job warnings for configurations

Customize Job Warnings for Configurations

In general, job warnings and error messages will be issued when problems or errors occur while processing a file. Files with a yellow warning in the Overview window have been processed but may have issues. They are placed in the Output Folder. Alternatively, when configuring the Queue, define an Output Folder with Warnings, where such files will be moved after processing. Incorrectly processed files, fatal errors or unsupported file types are highlighted in red and are moved to the Error Folder.

The list contains all existing warning messages. Their behavior can be customized independently for any configuration, for example if you don’t want a warning message for a certain problem or if you feel that a problem is so serious that it should better be treated like an error.

Note: The behavior of error messages can’t be changed.

Job Warnings can be adjusted individually: Right click on the desired job warning to open the context menu. Select Inactive, Active or Active (Treat as Error).

Inactive: Deactivates the job warning in the selected configuration. The Overview window no longer displays a yellow warning.

Active: Activates the job warning in the selected configuration.

Active (Treat as Error): Treats the associated problem like an error. The file will be highlighted in red and moved to the Error Folder.

Reset: Resets the changed warnings to the default settings.

ColorAnt | Color Editor

Color Editor

Manual editing of patches and best possible spot color conversion

Color Editor

The Color Editor tool covers several applications:

  1. Best possible conversion of colors (usually spot colors) using ICC profiles.
  2. Saving spot colors converted with Color Editor in various color formats for use in other applications.
  3. Manually changing color names.
  4. Manually changing Lab values and device values assigned to a color patch.
  5. Adding or removing color patches.

Overview of the Color Editor

On the left side is a table with the colors of the loaded measurement file. It contains the following information:

  • Color: Name of the color
  • Measurement: Measured color values in Lab (spectral values are retained but shown as Lab)
  • Current (DCS): Specifies the current device values. Displays the device values after applying the settings and functions on the right side.
  • Profile (DCS): Displays the device values resulting from a conversion using the selected profile on the right-hand side.
  • dE00 (Current): Displays the absolute colorimetric DeltaE 2000 values, which result from the measured Lab values and the current device values.

Single, multiple or all color values can be selected in the table and then edited with the tools on the right. The color table can be sorted by Color or dE00 (Current) by clicking on the column headings.

Below the table are two buttons to Add or Delete patches as well as the Invert Selection button.

Invert Selection: Provides a quick and easy way to reduce a large number of displayed colors of a large data set to only a few colors. Simply select the desired color patches, click Invert Selection followed by the Delete button. Now you are working on your individual color selection.

Search: Helps to find and edit specific colors of large data sets. Type in the name of the desired color and the list will show only colors with those name components.

Tip: Combine the Search with Invert Selection
If, for example, you would like to edit all colors with the name component ‘Red’ of a Pantone library as a small list, enter ‘Red’ in the Search.
Select the colors found, then delete the search term and click on Invert Selection.
By pressing the Delete button, only the colors with the name component ‘Red’ remain in the list. All others are removed.

Optimizing spot colors using the Color Editor

The right side of the tool is divided into four control panels:

Measurement Information: Shows the Name, the measured Lab value (CIE) and the current device value (DCS) including the color space for the selected color field.

Color Conversion Settings: Define the Profile and the Mode for the conversion of the measured values. Six modes are available for the color conversion:

  1. Precise Match – Proofing
    Spot colors are reproduced as accurately as possible on a proof printer. This method is not suitable for production as it may use all process colors for spot color simulation to achieve the best result (based on DeltaE 2000). The full tone is calculated with the aim of achieving the smallest possible DeltaE 2000 value. No channel reduction or print optimization is applied.
  2. Visual Match – Utilize More Channels
    Produces visually the best possible conversion with high color accuracy and with excellent printing properties. Full tones of spot colors are converted with as few channels as possible and still remain colorimetrically accurate. This method is suitable for digital printing, large format inkjet printing or offset printing with a fine screen ruling and good register accuracy.
  3. Use the least Amount of Channels possible
    A good method to convert full tones of spot colors with a minimum number of channels and still get colorimetric accurate results. Choose this method for packaging printing where pure colors are desired. One or two-color combinations are also included in the search for the best possible color combination.
  4. Use one Output Channel only
    Useful for print packaging production. The spot colors used for text and bar codes will be converted using a maximum of one process color.
  5. Use a Maximum of two Channels
    Uses one or two output channels. Best for one or two process colors providing the best colorimetric match selected for each spot color automatically. The results are very clean separations that are easily printed, but not necessarily very exact in colorimetric terms. It is recommended to only use this function for individual, manually created spot colors.
  6. Use a Maximum of three Channels
    Uses one to three output channels. Similar to the calculation method Use the least Amount of Channels possible. No more than a maximum of three channels should be used. Choose this method for packaging printing, where the purest possible colors are to be produced and not more than three process colors for spot color conversion must be used. Single-color and two-color combinations are also included in the search for the best color combination.

dE00 Limit: Colors exceeding the set threshold are marked with a warning symbol.


Optimize Output Values: Displays the current device values for the selected ICC profile.

  • By clicking on dE76 or dE00 the deltaE can be minimized for each color.
  • Automatic: Uses the selected ColorLogic calculation mode, typically reducing the number of channels for better printability.
    Note: By deactivating the checkboxes for the color channels, the values displayed in the number fields are fixed (for example 0% or 100%) so that they are not changed when applying dE76 or dE00. However, this does not apply to Automatic, here, all channels are always taken into account.
  • Revert: Undoes all changes.

The fourth panel Color Information displays various information about the selected color:

  • Reference: Measured Lab value of the color
  • Profile: Shows the color value calculated with the process colors of the target profile
  • Current: Optimized color value of the process colors
  • dE76: Expected color difference in DeltaE 76
  • dE00: Expected color difference in DeltaE 2000
  • Paper white simulation: Considers the coloration of the substrate for the target color space
    Note: It is recommended to activate the Paper white simulation.
  • Divided color preview: The divided color preview shows how the original color (upper bar), the non-optimized color by means of the profile (left lower square) and the optimized color (right lower square) would look like when printing. The color preview is displayed in true colors on a calibrated and profiled monitor.

    Comparison of original color (Reference), non-edited color (Profile) and edited color (Current)

    After editing the measured values, a file with the optimized device and/or measured values is created by clicking on Start.

Note: The Color Editor tool is grayed out if the file loaded under Data Sets does not contain any measured values. Once a single measurement file has been selected, it can be opened in the Color Editor (multiple files cannot be opened simultaneously).

Color Editor Use Cases

Example: Best possible conversion of (spot) colors

Measurement data from spot colors loaded into ColorAnt can be converted into any color space using the Color Editor and ICC profiles. All color spaces including RGB, CMYK and Multicolor are supported.

Note: The Conversion of Multicolor profiles requires an L license.

To convert a spot color to RGB, CMYK or Multicolor, follow these steps:

  1. Load the measurement data file including individual full tone spot colors (for example a spot color library as CxF file) under Data Sets in ColorAnt, select the file and then click Color Editor.
  2. Under Color Conversion Settings, select the desired ICC Profile from the drop-down menu.
  3. The table on the left side fills with the device values. Initially, the device values are identical for Current (DCS) and Profile (DCS), since no optimizations have yet been made.
  4. Select the color you would like to optimize from the table and a Mode under Color Conversion Settings.
    The calculation mode specifies how ZePrA should convert one or more spot colors to the target color space.
  5. Choose one of the three modes described above. Under dE00 Limit, enter the threshold value in DeltaE 2000 from which colors in the table are to be marked with a warning symbol.

  6. The control panel Optimize Output Values shows the device values (Current DCS) calculated with the selected ICC profile. The calculation is always absolute colorimetric.

  7. Now click on Automatic to convert the colors using the selected calculation mode. Alternatively, perform the calculation according to DeltaE76 (dE76) or DeltaE 2000 (dE00). However, these two methods do not include ColorLogics high-quality calculation modes. The device values are displayed immediately after application of the calculation.

    By clicking on Revert the changes can be undone.
  8. The Color Information panel shows the measured Lab value of the color under Reference, the color value calculated with the process colors of the target profile under Profile and the optimized color value under Current. Additionally, the expected color difference is displayed in dE76 (DeltaE 76) and dE00 (DeltaE 2000). Activating the checkbox Paper white simulation takes the coloration of the substrate for the target color space into account. The calculation of the Lab values for Current and the color distance (DeltaE) are performed accordingly.
    Note: It is recommended to activate the Paper white simulation.
    Divided color preview: The divided color preview shows how the original color (upper bar), the non-optimized color by means of the profile (left lower square) and the optimized color (right lower square) would look like when printing. The color preview is displayed in true colors on a calibrated and profiled monitor.

    Comparison of original color (Reference), non-edited color (Profile) and edited color (Current)

  9. If you want to make fine adjustments, manually optimize the percentages in the Optimize Output Values control panel and see the effects directly under Color Information.
  10.  If you are satisfied with the optimization, continue optimizing more colors. Optimized colors are updated directly in the table. With a click on Start the editing is completed using the device values shown under Current (DCS) and the dialog will close. Please note that colors that have not been optimized will only be converted using the normal profile conversion and may therefore not achieve the best possible result.

Specifics

  • If you would like to optimize several or all colors in the table at once, select the desired colors and click on the desired calculation (Automatic, dE76 or dE00).
  • If two or more colors are selected, device and color values are grayed out in the panels Optimize Output Values and Color Information.
  • If a file previously optimized with an ICC profile in the Color Editor is re-opened in Color Editor, the previously used ICC profile is preselected automatically.
  • If you change the ICC profile, typically, the device values have to be recalculated. To do so, activate the checkbox Recalculate DCS values and confirm with OK.

Confirm recalculation of the DCS values

Example: Saving color-converted spot colors to other formats
Spot colors converted with Color Editor can be saved in various color formats supported by ColorAnt and used in other applications.

  •    CxF or CxF/X-4 for use in many modern applications
  •    Adobe Swatch Exchange (ASE) for use in Adobe Illustrator and InDesign
  •    ACO for use in Adobe Photoshop
  •    ICC Named Color Profiles for use in programs that support this special ICC format.

The complete list of supported formats can be found here.

Note: Spot colors converted with Color Editor contain the original color values (Lab or spectral values) and the optimized device values for the selected ICC profile.

Example: Manual Editing

The Color Editor also allows to manually change color patch names or color names, to manually change the measurements and device values associated with a color patch, and add or remove individual color patches. Make the appropriate changes in the topmost control panel Measurement Information.

Under Name change the name of (spot) colors or color patches of test charts.

Under
CIE edit the measured values of the color, under DCS edit device values (if present). Typically, DCS values are not available in a pure spot color measurement file.

Using the buttons below the table (Add, Delete), selected colors can be removed or one or more colors can be added. Added colors are placed at the end of the table. A default name and a medium gray are preselected, which can be changed under Measurement Information as required.

Specifics

  • Measurements of profiling test charts often have no name designations. For such measurements, the Color Editor automatically adds an identifier, for example #1 for the first patch.

  • Spectral measurement data can also be edited in the Color Editor. They are then displayed as Lab values with D50/2 degree standard observers. In the final file, however, the spectral values are preserved.
  • If the CIE values of spectral measurements are edited as Lab values, the spectral properties of the color are retained.
  • We recommend not to change or optimize DCS values in test charts if the data is used for profiling purposes.
  • When selecting an ICC profile, typically, the device values don’t have to be recalculated. Deactivate the checkbox Recalculate DCS values and confirm with OK.

Recalculating colors without changing the DCS values