class PDF::Reader::Filter

def initialize (name, options = nil)


returned untouched. At this stage PDF::Reader has no need to decode images.
Filters that are only used to encode image data are accepted, but the data is

creates a new filter for decoding content.
############################################################################### 
def initialize (name, options = nil)
  @options = options
  case name.to_sym
  when :ASCII85Decode   then @filter = :ascii85
  when :ASCIIHexDecode  then @filter = :asciihex
  when :CCITTFaxDecode  then @filter = nil
  when :DCTDecode       then @filter = nil
  when :FlateDecode     then @filter = :flate
  when :JBIG2Decode     then @filter = nil
  when :JPXDecode       then @filter = nil
  when :LZWDecode       then @filter = :lzw
  when :RunLengthDecode then @filter = :runlength
  else
    raise UnsupportedFeatureError, "Unknown filter: #{name}"
  end
end