The final data reduction technique provided by the raster area involves the printer’s ability to fill in trailing zeros to the edge of the raster area. Any zeros following the last “1“ in the raster row to the edge of the picture area need not be sent. The printer automatically fills them. This technique eliminates the need to transmit raster data rows that are all the same length, as required in a raster image which does not use the raster area feature.

The raster area represents a boundary. Within this boundary the printer zero-fills missing rows and fills in short rows to the edge of the raster area. However, in addition to filling to the boundaries of the raster area, the printer also clips any raster line which extends beyond the boundary. Thus, if an image extends beyond the raster area, then that portion of the image is not printed.

When the raster area reduction techniques are used in conjunction with the raster compression techniques, a considerable savings in data can be realized. This results in a saving of host storage and data transmission time. However, these reduction techniques do not reduce the amount of printer memory required for page formatting.

EN

Introduction 15-3

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HP 5961-0509 manual