Record with info about PNM image used in both loading and saving functions.

public TPortableMapInfo = record
  Width: LongInt;
  Height: LongInt;
  FormatId: AnsiChar;
  MaxVal: LongInt;
  BitCount: LongInt;
  Depth: LongInt;
  TupleType: TTupleType;
  Binary: Boolean;
  HasPAMHeader: Boolean;
  IsBigEndian: Boolean;
  end;

ImagingPortableMaps (at line 46)