The CSP reads the data from the PFR and images the font character shapes at any resolution and any size at the receiving end. The size of the PFR varies according to the number of different character shapes in the recorded document. TrueDoc achieves its high level of compression through a combination of tactics. First, TrueDoc usually records only the character shapes in the document. This is called character subsetting.
Hints can take up a lot of room in fonts.
Bitstream has developed an extremely compact hinting technology to keep TrueDoc PFRs as small as possible. Within the viewing application that the portable document application manufacturer provides, the user sees exact replicas of the character shapes from the original document. TrueDoc is completely resolution and size independent. The TrueDoc PFRs contain fully scalable outline fonts. TrueDoc can print documents in two different ways.