When you use internal Acrobat fonts in producing your PDF file, the PDF Print Driver maps your printer fonts from the FXR file to internal Acrobat fonts. Because printer fonts in FXR file differ from the internal Acrobat fonts, the PDF Print Driver adjusts the point size of the font to produce each piece of text so that the total character width of the text in the PDF file matches the character width of the text as it would have printed using the printer font. This may cause the height of text to vary slightly. This is done to maintain the proper character width of the text.
The following example may help to understand the issue. The two sentences below represent the text from a FAP file and that same text, rendered using an internal Acrobat font.
This is Arial 24 point.
This is Arial 24 point.
The first line uses an Arial 24 point font. The second line uses a 21 point Verdana font. If your system has both screen fonts installed, the periods at the end of each sentence will appear line up together (or nearly so).
While the two fonts are similar in design, you can see that the heights and widths of the characters are different. For this particular sentence, a 21 point Verdana font will approximate the width of the same text when using an Arial 24 point font.
Similarly, our PDF Print Driver determines the point size of the internal Acrobat font to use such that the total width of the text string is identical to the total width of the text string in the original form (FAP file).
If higher fidelity is required, you can embed a PostScript or TrueType font that has the exact metrics of the original printer font used in the FXR file. This creates a larger PDF file and a higher fidelity document.
Consider the alternatives and decide which approach best meets your needs — using internal Acrobat fonts (less fidelity, smaller file size) vs. embedded fonts (high fidelity, larger file size).
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