Access the Calibration Wizard from the Printer Scheme Manager in neoStampa's upper bar on the main window. The Calibration wizard button is at the bottom left corner of the Printer scheme manager, or else, start the wizard with the shortcut on the PC desktop.
In the first window of the Wizard you are required to introduce the most basic information for the calibration. The buttons at the bottom (apart from Configure) allow to move through the different windows of the Wizard, and to Exit the Calibration, whether saving it or not.
- In the upper part of the window are the settings of the printer you want to make the calibration with.
- There are three options in the Action selection field. The first is to start a new calibration.
- Configure the spectrophotometer device from the 'Configure', which will open the window to set the device you are going to use for measurements.
- The content of this window is driver specific. Quality is usually printer dependent and is provided by the driver specifications of each printer.
- The Color mode is available selection depends on the printer specifications.
- Choose the dithering type. Two of them are the most common to use: Smooth Stochastic (default) and Diffusion v2.
Ink Limit and Linearization
- STEP 1 - Ink Limit: Print out the absolute ink limit chart. To evaluate the test chart make sure that the print has dried and - if using textile material - fixated or steamed and washed. If all of the color-mix patches are bleeding you should first try to find out whether the material is not suited for the inks or the print has been made with a too high resolution.
- STEP 2- Single Ink Cut: Print out the single ink limit chart. Once the print is ready washed and dried or vaporized proceed with the Measurement. Press the 'Measure...' button and connect the spectrophotometer. When you finish the reading, the Densities and Ink cut dialog will pop-up. This dialog shows the measurement results based on LAB measurements per color. The Wizard will perform an automatic ink cut, based on the values obtained. The new values are based on 100% of ink. The single cut will be measured by the software.
- STEP 3 - Linearization: In Linearization, you are able to see the performance of CMYK ink set with light ink set in post-linearization curves. After printing the test file, proceed to connect the spectrophotometer, as you did before. and start reading the lines carefully and slowly according to given specifications. Get 3 measurements for each print and the Wizard will produce average values from the 2 or 3 measurements.
This process allows to determine which combination of inks provide the best black as well as to prevent dithering from black ink in light areas if you don't have a gray ink in combination. hueman v2 Black generation provides 3 methods to generate the black ink.
- Default (Black Only): In this case the black generation will be black only.
- Black Addition: The black generation will add the defined values of the additional inks to improve the overall darkness of the result.
- Gray Component Replacement (GCR): The method replaces light areas of black with a combination of CMY inks, to visually minimize the dithering from the black ink. Be aware that such a GCR can be critical since the light fastness of C, M and Y are not always the same and that after a certain time one of the inks might fade faster than others resulting in a non-neutral behavior of gray areas (e.g. outdoor flag printing).
This is the step in the calibration process where the ICC profile is generated.
- In order to print a target for your spectrophotometer, select from the drop-down list the appropriate target: Small/Medium/Large/Very large/Custom. For a high-quality profile, you should print at least 1500 patches for paper prints, and 2250 for textile prints. As with all charts, you have to steam and wash it, or have it dry for a couple of minutes (paper printing) after printing.
Start reading the lines carefully and slowly according to given specifications. Be sure to read slowly regular the lines, one by one. Measure three targets to make an average between the measurement. This will improve the quality in the profile while remove interruption in the measurement. This is useful when for example the media is rough, and we want to get much precise results. The Wizard will produce average values from the three measurements using the the average methods.
With 'Smoothing' you can specify a certain amount to smooth out error measurements, although much of it is avoided by choosing to do three measurements of each test file. The more you smooth a profile the less precise this will be, so smoothing should apply only if the global precision of an ICC profile is maintained, and the most important aim is to achieve smoother gradients in printing.
Chose the profiling presets:
Default RGB profile is used in standard print flow, which relates to Perceptual rendering intent.
- Color matching RGB profile is used in printers workflows, which relates to Saturation rendering intent.
- Before starting generation of profile, you will be asked to save the icc profile into location of the printer scheme folder using the same name. It is recommended to give the same name to the profile that you gave to the complete calibration, to avoid confusion. You can also specify where you'd like to save the generated profile; typically, in the desktop since you can easily distribute if from there, or within your profile folder. During the profile generation the generating process is visible in the profile log. When 100% of the process is reached, the icc profile generation was successful.
Calibration Test Print
We have reached the last step of the Calibration after the printer profiling. A test workflow to verify the quality of the calibration using print parameters and files.