SECTION 3.3
79
Filters
KEY
TYPE
VALUE
EndOfLine
boolean
A flag indicating whether end-of-line bit patterns are required to be
present in the encoding. The
CCITTFaxDecode
filter always accepts
end-of-line bit patterns, but requires them only if
EndOfLine
is
true
.
Default value:
false
.
A flag indicating whether the filter expects extra 0 bits before each
encoded line so that the line begins on a byte boundary. If
true
, the
filter skips over encoded bits to begin decoding each line at a byte
boundary. If
false
, the filter does not expect extra bits in the encod-
ed representation. Default value:
false
.
The width of the image in pixels. If the value is not a multiple of 8,
the filter adjusts the width of the unencoded image to the next mul-
tiple of 8 so that each line starts on a byte boundary. Default value:
1728.
The height of the image in scan lines. If the value is 0 or absent, the
image’s height is not predetermined, and the encoded data must be
terminated by an end-of-block bit pattern or by the end of the fil-
ter’s data. Default value: 0.
A flag indicating whether the filter expects the encoded data to be
terminated by an end-of-block pattern, overriding the
Rows
param-
eter. If
false
, the filter stops when it has decoded the number of lines
indicated by
Rows
or when its data has been exhausted, whichever
occurs first. The end-of-block pattern is the CCITT end-of-facsim-
ile-block (EOFB) or return-to-control (RTC) appropriate for the
K
parameter. Default value:
true
.
A flag indicating whether 1 bits are to be interpreted as black pixels
and 0 bits as white pixels, the reverse of the normal PDF convention
for image data. Default value:
false
.
The number of damaged rows of data to be tolerated before an error
occurs. This entry applies only if
EndOfLine
is
true
and
K
is non-
negative. Tolerating a damaged row means locating its end in the
encoded data by searching for an
EndOfLine
pattern and then sub-
stituting decoded data from the previous row if the previous row
was not damaged, or a white scan line if the previous row was also
damaged. Default value: 0.
EncodedByteAlign
boolean
Columns
integer
Rows
integer
EndOfBlock
boolean
BlackIs1
boolean
DamagedRowsBeforeError
integer