Printer driver architecture for reducing band memory

Details Printer driver architecture for reducing band memory Printer driver architecture for reducing band memory

1995-12-15

1998-03-10

Evans, Arthur G.

Pulse or digital communications

Spread spectrum

Direct sequence

395109, G06A 1500

Patent

active

057271372

ABSTRACT:
A system renders a print image while enabling reduction of the size of band memory. The printer driver includes a rendering driver comprising a driver interface, a drawing engine, an image and color library, band buffers and a color converter. The driver interface receives image data and drawing commands and transmits them to the drawing engine. The drawing engine divides the page into a series of bands, applies each drawing command for a band and renders the portion of an object in the band to a temporary buffer. To render an object, the drawing engine applies enhancement functions such as color biasing, image resolution enhancements, inverse dot gain transforms, etc. on the object and then applies a dithering function to convert intended color or gray-scale values of objects in the band to bi-level planar pixel matrices. By applying the dithering function before storing each band in band buffer memory, the size of the requisite band buffer memory is significantly reduced. The drawing engine transfers the rendered object to a band buffer. The color converter converts the band color from a band buffer color format to a printer color format and then transmits the banded image to the spooler for printing.

REFERENCES:
patent: 4768082 (1988-08-01), Hiratsuka et al.
patent: 5251046 (1993-10-01), Kato et al.
patent: 5506944 (1996-04-01), Gentile

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