Image filters supported in PDF include the general purpose filters

    * ASCII85Decode a deprecated filter used to put the stream into 7-bit
      ASCII
    * ASCIIHexDecode similar to ASCII85Decode but less compact
    * FlateDecode a commonly used filter based on the DEFLATE or Zip
    algorithm
    * LZWDecode a deprecated filter based on LZW Compression
    * RunLengthDecode a simple compression method for streams with
    repetitive data using the Run-length encoding algorithm

and the image-specific filters

    * DCTDecode a lossy filter based on the JPEG standard
    * CCITTFaxDecode a lossless filter based on the CCITT fax compression
      standard
    * JBIG2Decode a lossy or lossless filter based on the JBIG2 standard,
introduced in PDF 1.4
    * JPXDecode a lossy or lossless filter based on the JPEG2000 standard,
introduced in PDF 1.5