Microsoft KB Archive/47636

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Interlacing Graphics in Word; Values in Printer Driver

PSS ID Number: Q47636 Article last modified on 11-02-1994




Interlacing is a printing technique used to achieve higher resolution and to improve print quality. Interlacing prints a line of graphics, then returns and prints another line a fraction of a dot lower than the previous pass. Interlacing can be used only when bit 0 of RasterInfo is set. For interlacing to work properly, bit 12 of RasterInfo must also be set. This is contrary to the “Printer Information for Microsoft Word” manual, which states on Page 238 that bit 12 is reserved.

To set the appropriate interlacing values in the Graphics Device Description of the Word 5.00 printer driver, first determine how much you have to linefeed for interlacing. Your printer manual provides this information. Give the fractional amount in the two values PixInterlaceNumer and PixInterlaceDenom.

The other two interlacing values, PixHeightNumer and PixHeightDenom, should be set as the fraction of Bits-(PixInterlaceNumer/PixInterlaceDenom). “Bits” is the number of bits for each graphics pass.

For example, an Apple ImageWriter II can print 72 dots per inch vertically, but it can linefeed to the precision of 144 dots per inch; therefore, one linefeed pushes down the print head far enough to put the next pass between the first pass. In this case, both PixInterlaceNumer and PixInterlaceDenom would be set to 1.

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============================================================================= Copyright Microsoft Corporation 1994.