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To create a random colour from the CMYK system, a number of drops of different colours must be placed on the substrate with, perhaps, some blank spaces left.
To avoid blurring the drops should not be placed on the same spot, but next to each other; the area that is needed to display a random colour will therefore be bigger than the area which is covered by one ink dot.
This is why the spatial resolution of an inkjet printer is smaller than the theoretical monochrome resolution, which is given in dpi (dots per inch) in the printer specification.
In practical work, this limitation is not so apparent.
Where a high spatial resolution is necessary (with sharp, contrasting edges), the colour resolution may be reduced without any resulting problems in its appearance.
These details are usually not user controlled - the necessary algorithms are implemented in the printer or the RIP (raster image processor) software………..