| 摘要 |
<p>In a printing system constituted by a host computer (1) and a printer (3), in an operating system (7) of the host computer, a GDI module (9) receives a drawing command from an application (5), and converts this drawing command into another drawing command which can be understood by a printer device driver (11). In the device driver, first, a preprocessor (15) receives the drawing command from the GDI module, and detects black areas contacting with color areas in figures or characters in a page on the basis of this received drawing command. Next, the preprocessor revises the drawing command so that the color of black areas contacting with color areas is changed from pure black to composite black. After this, the revised drawing command is sent to a rasterizer (17) and a half toning portion (19) sequentially, and converted into bit map data which can be understood by the printer. This bit map data is supplied to the printer through a print manager (13). <IMAGE></p> |
