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Lineariser The Lineariser application creates a Linearisation Curve for an output device (printer). Assigned to a Media after paper profiling, it brings the output device to a known (linear) state. This means a 50% Cyan will print at 50%. The user first prints a stepped wedge chart for a selected Spectrophotometer/Densitometer to the output device in the colourspace specified by the Media. The chart is measured and the resulting curve is saved, assigned to the Media and a History recorded. At this stage, ICC profiles can be created and applied for accurate colour representation. If the printer output varies due to ink batches or head wear, a quick re-­‐linearisation process is all that’s required to get back to the same linear state initially created. The original ICC profiles can be re-­‐
applied to achieve the same colour output. The Interface The Lineariser window is made up of a Toolbar and a number of panels – Available Media, Linearisation History, Measurement, Advanced Options, Spectrophotometer or Densitometer information and Curves display. Toolbar The Toolbar has the following options (also available via the Lineariser Menu): •
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Customise Patches – Allows for the selection of patches to be used in the Linearisation Chart. Choose which Patch Percentages using the numbered buttons. Total number of patches selected is displayed. o Restore Defaults – Restore the patch selection to the default 23 patches per channel. Use Lab – Toggles between Density and Lab measurement modes. Lab mode for linearisation is required for printers with built-­‐in Spectrophotometers. Measure Patches – Initialises the connected Spectrophotometer. Follow any instructions in the status bar to measure the chart. Submit Linearisation – Save the data in the Measurement panel to the Media being linearised. A popup will request a name for the curve. Note: The Customise Patches and Use Lab options are new to Megarip Version 5. If viewing curves loaded from a Version 4.x or earlier database, the options will be unavailable until the Update Legacy Curves option is selected from the Measurement panel contextual menu (see below). There is no need to update Version 4 curves if the printer is performing satisfactorily. However, there have been significant improvements made to the Lineariser so it is worth considering re-­‐linearising with Version 5. Available Media This panel displays a list of available Media. Select a Media to view its current linearisation curves and data, or to linearise a new Media. Any changes made are applied to the currently selected Media. Linearisation History Shows a list of all the linearisations performed for the selected Media, allowing the user to track the performance of the output device. The following sort columns can be selected using the contextual menu on the column header bar. Column order can be changed by dragging and dropping the columns into the desired order, or by using the Configure Headers option in the context menu: •
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Date – Date and time the linearisation was measured. Type – Shows whether each linearisation curve was measured in Density or Lab mode. Serendipity Megarip User Manual – Version 5.3 76