HP Latex 310 Users Guide - Page 104

Color calibration can be launched from the front panel, after pressing Modify preset, or when adding a new substrate. In outline, the process consists of the following steps. 1. A calibration target is printed. 2. The colors on the calibration target are measured automatically. 3. The calibration target measurements are compared with an internal reference to calculate the necessary calibration tables for consistent color printing on the substrate in use. Factory default calibration tables are used whenever color calibration has never been run. The first time color calibration is run, the current printing color is taken as a reference, and factory default calibration tables continue to be used. This means that, after the first color calibration, the printed colors do not change, but are recorded as the reference for future calibrations. Subsequent color calibrations compare calibration target colors with the recorded reference, in order to calculate new calibration tables for consistent color printing on that particular substrate type. From the front panel, you can delete the current calibration table, leaving the factory default calibration table active, as if that particular substrate had never been calibrated. Press , then Image quality maintenance > Color calibration > Reset to factory. Color calibration as described above is not recommended for the following substrate types. It may be possible to calibrate some of these substrates by using an external color measurement device, driven by an external RIP. ● Non-opaque substrates such as clear film and backlit substrates. ● Substrates with an uneven surface, such as perforated vinyl and punched-window substrates. ● Porous substrates that require the use of the ink collector. Substrates suitable for color calibration include even-surfaced adhesive vinyls (neither punched nor perforated), PVC banners, and papers. Some substrates require the take-up reel for successful printing. However, the take-up reel may fail to cope with the backward movement of the substrate between the printing and scanning phases of color calibration. To perform color calibration when the take-up reel is in use, proceed as follows: 1. Ensure that the take-up reel is enabled. At the front panel, press , then Enable take-up reel. 2. Set the take-up reel's winding direction to the off position. See Unload the take-up reel on page 74. 3. Manually rewind the take-up reel, using the buttons on the take-up reel motor, to collect the substrate and raise the tension bar until it almost touches the take-up reel. 4. Launch color calibration from the front panel. 5. When the color calibration has finished, you can reset the take-up reel's winding direction. Color calibration for the 310 or 330 printer The color calibration test chart is printed using a fixed print mode with a high number of passes and fixed curing and drying settings to ensure printing consistency. However, parameters affecting substrate advance should be fine-tuned, and printheads should be aligned, before starting color calibration for the first time. 98 Chapter 4 Substrate settings ENWW