pdf - ccittfax

Parameters used for the CITT decompression filter
parameter	type	meaning	default value
K	integer	A code identifying the encoding scheme used: <math><0</math> pure two-dimensional encoding (Group 4) <math>0</math> pure one-dimensional encoding (Group 3, 1-D) <math>>0</math> Mixed one- and two-dimensional encoding (Group 3, 2-D), in which a line encoded one-dimensionally can be followed by at most <math>K - 1</math> lines encoded two-dimensionally. The filter distinghishes among negative, zero, and positive values of K to determine how to interpret the encoded data; however, it does not distinghish between different positive K values.	0
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.	false
EncodedByteAlign	boolean	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 encoded representation.	false
Columns	integer	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 multiple of 8 so that each line starts on a byte boundary.	1728
Rows	integer	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 filter's data.	0
EndOfBlock	boolean	A flag indicating whether the filter expects the encoded data to be terminated by an end-of-block pattern, overriding the Rows parameter. 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-facsimile-block (EOFB) or return-to-control (RTC) appropriate for the K parameter.	true
Blackls1	boolean	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.	false
DamagedRowsBeforeError	integer	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 substituting 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.	0