SECTION 3.3
67
Filters
TABLE 3.5 Standard filters
FILTER NAME
PARAMETERS?
DESCRIPTION
ASCIIHexDecode
no
no
yes
Decodes data encoded in an ASCII hexadecimal representation,
reproducing the original binary data.
Decodes data encoded in an ASCII base-85 representation, repro-
ducing the original binary data.
Decompresses data encoded using the LZW (Lempel-Ziv-Welch)
adaptive compression method, reproducing the original text or bin-
ary data.
(PDF 1.2)
Decompresses data encoded using the zlib/deflate com-
pression method, reproducing the original text or binary data.
Decompresses data encoded using a byte-oriented run-length encod-
ing algorithm, reproducing the original text or binary data (typically
monochrome image data, or any data that contains frequent long
runs of a single byte value).
Decompresses data encoded using the CCITT facsimile standard,
reproducing the original data (typically monochrome image data at 1
bit per pixel).
(PDF 1.4)
Decompresses data encoded using the JBIG2 standard,
reproducing the original monochrome (1 bit per pixel) image data
(or an approximation of that data).
Decompresses data encoded using a DCT (discrete cosine transform)
technique based on the JPEG standard, reproducing image sample
data that approximates the original data.
(PDF 1.5)
Decompresses data encoded using the wavelet-based
JPEG2000 standard, reproducing the original image data.
(PDF 1.5)
Decrypts data encrypted by a security handler, reproduc-
ing the original data as it was before encryption.
ASCII85Decode
LZWDecode
FlateDecode
yes
no
RunLengthDecode
CCITTFaxDecode
yes
JBIG2Decode
yes
DCTDecode
yes
JPXDecode
no
yes
Crypt