HP deskjet 600 User Manual

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Avoid using a Start Raster Graphics and End Raster Graphics command on every line.  
Use these commands at the beginning and end of the graphics image.

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When setting the raster graphics width, calculate the widest point of the raster image.  Use 
this value to set the width once for the entire raster graphics image.

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Avoid setting top margin or text length to values outside of the printable area.  This may 
cause data loss.

When using both the top margin and text length commands, the top margin command should
be sent before the text length command