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This is due to limitations in most output formats of pstoedit.
They cannot represent text with arbitrary inter-letter spacing which is easily possible in PDF and Post Script.
Pstoedit comes with a large set of format drivers integrated in the binary.This option allows specifying an additional Post Script file that will be executed just before the normal input is read.This is helpful for including specific page settings or for disabling potentially unsafe Post Script operators, e.g., file, renamefile, or deletefile. For this the output filename must contain a %d which is replaced with the current page number. This option sets the page size for the output medium. This causes the resolution to be changed to 300x300 dpi.With -pta, each character of a text string is placed separately.With -pti, this is done only in cases when there is a non zero inter-letter spacing.