Apply Correction DeviceLink Profile
The more reliable the color behavior of your printing machine is and the more accurately the corresponding ICC profile maps the printing process, the better the color conversion via ZePrA will be. In practice, however, it is often very different. Variations between the batches of paper, other dot gains or fresh inks that differ from the last series used can result in tonal shifts and deviations in the distribution of tonal values.
CoPrA SP* and the Update Profile module is integrated in the SmartLink module of ZePrA in order to compensate for these variations and deviations. Instead of having to generate a completely new printing machine profile and DeviceLink profiles for such deviations, the Update Profile makes the required adjustments. To ensure your printing machine prints the same color appearance as before, just a few details are required, such as the spectral measurements of dot gain strips or better still, the Reprofiler measuring strips that we provide with CoPrA.
The Correction DeviceLink profile will be applied after the color conversion defined in your configuration. So, you can continue to use your tried and tested DeviceLink profiles without having to replace them because of a change in the target color space of your printing machine.
Note: *SP = Serialized Profiles. The profiles created with CoPrA SP are encoded with the serial no. of the ZePrA color server and can only be used there.
Preparations for using the Updating Profile function
CoPrA’s Update Profile tool allows adjustments of an existing profile with just a few color measurements quickly and easily. Optionally a Correction DeviceLink profile to be applied in ZePrA can be created. Note that such profiles can only be used in ZePrA versions 4.6.2 and higher.
- Two types of Reprofiler control strips for different measuring instruments are included in the scope of delivery for both CMYK and RGB-based printing systems. For other color spaces use ColorAnt to create Reprofiler control strips.
- The small control strip is available as a one-row and a two-row strip. The one-row strip can easily be integrated in the trim area of your printing machine.The two-row strip is more suitable for digital printing or inkjet systems.
- The same applies for the large control strip, which contains significantly more color patches and is thus more suitable for optimizing relatively large color deviations.
Note: In principle, you can not only print and measure the ColorLogic control strips, but also other measuring strips, such as Ugra/Fogra, IDEAlliance Media Wedge, ECI GrayControl Strip, ECI bvdm TVI or UGRA UDKS Wedge, are supported too. Alternatively, you can use an existing measurement file that reproduces your current printing conditions.
- Once you have printed a control strip, measure it using a spectrophotometer.
- Make sure the color management settings are deactivated upon output of the control strip, i.e. without simulation of a printing condition for example. This is especially the case for digital printing systems.
- The Update Profile in CoPrA optimizes the ICC profile of your output profile (= printer profile that was selected in ZePrA as the Target Color Space).
Procedure in ZePrA
- In Configuration, Document/Target click the checkbox Apply correction DeviceLink profile. If there are no correction DeviceLink profiles, the option for Correction is completely grayed out.
- Click Settings to open the Correction DeviceLink Profile dialog and select a correction DeviceLink that has previously been created with CoPrA.
- We recommend that you not only select the Correction DeviceLink profile, but that you also embed the associated updated target profile into the converted files (Embed updated Target Profile instead of the Target Profile). When this option is enabled, this profile becomes the new output intent of a converted PDF file. The updated target profile is shown below.
Note: ZePrA checks whether there are corresponding correction DeviceLink profiles and updated printer profiles for the selected Target Color Space. These profiles will be shown and can be selected once the Apply correction DeviceLink profile has been enabled.