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How To Create An Opaque, Blank Or White Graph
DocumentID: 610740
Revision Date: 29-Feb-96 1:34:35 PM

The information in this document applies to:
WordPerfect® 5.1 for DOS

Problem

Symptoms: A customer was using a graphic (map) and wanted to place a User Box containing text on top of this graphic. The customer also wanted the User Box to have a white background, so that the map below it would not show through. Solutions: The customer used GRAB.COM and "grabbed" a blank View Document screen, which captured a blank box, then retrieved this blank graphic into the User Box to obtain the white opaque background. The customer then made another User Box and placed the text in it, and then placed it directly over the top of the User Box that contained the opaque background. If a customer wants a white background on top of another graphic or a shaded graphics box, the GRAB utility will allow them to do this by creating an opaque graphic.

Whether or not a graphic with an opaque white area overlaying another graphic will print with the "lower" graphic showing through is printer dependent. Some printers (like the HP LaserJet Series II) only know how to draw black dots. This means that as WP prints the overlaid graphics, it will place dots on the paper for the first graphic, then place dots for the second graphic. It will always print the lower graphic showing through the upper graphic. Other printers (like PostScript or HP LaserJet III) know how to erase dots as well as draw them. This means that as the second graphic is drawn over the first. Any area in the image that is defined as opaque white will be "erased." Areas that are defined in the top image as empty or transparent will still allow the lower image to show through.

On printers like the HP LaserJet Series II, customers cannot get a white graphic object to "erase" lines from a image underneath it. Customers would have to use a drawing package, overlay the images there, and export them as one file. Or customers could use a screen capture program (like GRAB) to capture a screen image that displays the way they want. Creating the image in a drawing program will provide much better results than GRAB, as most drawing packages support higher resolutions than GRAB.

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