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Calling the Raster generator

You can alter the shape, angle and size of raster points with the Raster generator module. As this does not link to the Top row, the only way to call up the module is to use the corresponding icon in the Page module or the Print dialog. If necessary load RASTCACH.CXM first via External modules in the File menu.

First you will see the following dialog box in which you can set raster point options for the currently selected frame, the displayed page or the complete document. In addition you can also delete the raster for a frame or a page:

If you have not selected any frames, or have selected more than one frame, the Frame icon will be greyed out and not selectable, of course. The same applies for the icons for deleting rasters if a frame or the current page does not contain user-defined rasters.

The Raster generator can be switched off directly so as to use the ordered dithering printing raster incorporated into Calamus (ideal for inkjet printers):

To switch off the Raster generator, select the radio button Always use ordered dithering., otherwise the Raster generator will be used generally unless the output resolution is lower than the value specified in the editable field of the lower radio button. So if this is set to 601.000 dpi, for instance, output to a 600 dpi laser printer would be dithered.

The present version of the Calamus Raster generator offers the option to store the rasters that are generated for a printout in a so-called raster cache. This cache will be saved automaticaly as a file on the hard disk. If the same raster is required again, then the Raster generator will recognise that it has already created it and so does not perform the intensive raster calculations for a second time. Instead it will use the memorized raster from the cache. In most cases this is appreciably faster.

The file with the created raster will be saved to the same folder as the default raster (DEFAULT.CRI), which is loaded automatically when Calamus is launched. This file (RCACHE.INT) can also be deleted, of course; this will then destroy the memory of the Raster generator and the next creation of a similar raster will take some time at first.

This mechanism can be switched on and off with the Generate cache checkbox, so – if you really want this – you can let the raster be generated anew each time. This can be important if many documents with different raster settings have to be output, as with the cache switched on the RCACHE.INT file can become unnecessarily large.

Tip: Calamus's virtual memory should be switched on, if necessary, as otherwise the objects of the additional cache list occupy an unnecessary amount of RAM. If the virtual memory of Calamus is switched on, then the data will organize itself, namely in a way that only the most frequently required portions are held in RAM.

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Last updated on June 24, 2015

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