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Consider the following scenario. In Microsoft Office PowerPoint 2007 or in PowerPoint 2003, you create a shape whose width is equal to the width of the slide. You fill the color of the shape. Then, you configure the shape and the texture of the background. Next, you put the shape onto the background. On the screen, the background becomes invisible because the background is completely hidden behind the shape.
In this scenario, when you use a color printer to print the slide, a small part of the background is printed on the right edge of the slide. This small part of the background may appear as if ruled lines were drawn.
This issue is caused by the combination of an error of the Graphics Device Interface's (GDI) coordinate calculation and of the logic of PowerPoint's coordinate calculation. Because of this combination, the shape is drawn one dot-pixel smaller than the background. Because this issue is not caused by the processes of the printing devices or of the printer drivers, this issue may occur in several printers. However, this issue does not occur in PostScript printers. This is because PostScript printers use a different sequence in the printing process, and data is not sent through GDI.