Graphic Bitmapped Files Not Retaining Origina

DocumentID: 607807
Revision Date: 29-Feb-96 1:32:31 PM

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

Problem

Symptoms: Why don't bitmapped files from other graphics programs retain their original size when retrieved into or converted to WordPerfect? When defining a graphic, if the Size is set for Auto (Both), the image should go to the original size, but it does not. Solutions: The most common reason TIFF images don't import correctly to WP 5.1 is that the header information is wrong. In 5.0, we didn't read this prefix, but we do in 5.1. Of the 100 or so bitmapped files I have reviewed, only 2 or 3 were actual problems with WP. Here is a good rule of thumb: If the image is importing elongated, then the pixel height and width information in the file prefix is messed up (i.e., the pixel is defined to be 10" wide by 4" high). If the image won't scale, the start.WPG record is not proportional to the bitmap record (another prefix problem that occurs when the TIFF format is created). To reproduce bitmaps at the same size as the original, the information about the bitmap, contained in the bitmap file, needs to include the correct resolution data for the original bitmap. Resolution is usually defined as dots per inch (dpi), dots per millimeter (dpmm) or dots per some other unit of measure, and are given for the horizontal and vertical directions. WP needs the horizontal and vertical resolutions to be the same (square dots), and the resolutions need to be expressed in dpi. However, there are a lot of bitmap files that do not contain this information (TIFF - see below), or the information is obviously erroneous, i.e., 1 dpi (may be OK if the display device is a billboard). Rather than ignore the user who knows nothing about the resolution of bitmapped images, WP tries to accommodate them by assuming some commonly used resolutions, i.e., 75 or 300 dpi (horizontal and vertical) for most files. By making this assumption though, some files will lose the original resolution data. These files, and those that have erroneous data, cannot be guaranteed to have the original resolutions. Since the resolutions are used to calculate the size of the image, if the resolutions are changed, the original size of the image cannot be reproduced. Some TIFF files are especially prone to this problem, as TIFF allows the resolution unit to be expressed in dpmm (dots per millimeter), or abstract (not defined).

Answer:

Details:

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