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+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it!  If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Pamfix User Manual" 0 "06 March 2014" "netpbm documentation"
+
+.SH NAME
+
+pamfix - repair a Netpbm image with various corruptions
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBpamfix\fP
+
+[\fB-truncate\fP]
+[\fB-changemaxval\fP]
+[\fB-clip\fP]
+[\fB-verbose\fP]
+
+[\fInetpbmfile\fP]
+.PP
+Minimum unique abbreviation of option is acceptable.  You may use double
+hyphens instead of single hyphen to denote options.  You may use white
+space in place of the equals sign to separate an option name from its value.
+
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBpamfix\fP reads a stream that is mostly a Netpbm image but may have
+certain types of corruptions and produces a valid Netpbm image that preserves
+much of the information in the original.
+
+In particular, Netpbm salvages streams that are truncated and that contain
+illegally large sample values.
+.PP
+\fBpamfix\fP looks at only on the first image in a multi-image stream.
+
+
+.UN truncatedstream
+.SS Truncated stream
+.PP
+This is a stream that is missing the last part.  Netpbm corrects this
+by creating an output image that simply has fewer rows.
+.PP
+You select this kind of repair with a \fB-truncate\fP option.
+.PP
+The header of a Netpbm image implies how large the image must
+be (how many bytes the file must contain).  If the file is actually
+smaller than that, a Netpbm program that tries to read the image
+fails, with an error message telling you that it couldn't read the
+whole file.  The data in the file is arranged in row order, from
+top to bottom, and the most common reason for the file being smaller
+than its header says it should be is because the bottommost rows are
+simply missing.  So \fBpamfix\fP assumes that is the case
+and generates a new image with just the rows that are readable.
+(technically, that means the output's header indicates a smaller
+number of rows and omits any partial last row).
+.PP
+The most common way for a Netpbm file to be small is that something
+interrupted the program that generated it before it was finished writing
+the file.  For example, the program ran out of its own input or
+encountered a bug or ran out of space in which to write the output.
+.PP
+Another problem \fBpamfix\fP deals with is where the file isn't
+actually too small, but because of a system error, a byte in the middle of
+it cannot be read (think of a disk storage failure).  \fBpamfix\fP
+reads the input sequentially until it can't read any further, for any
+reason.  So it treats such an image as a truncated one, ignoring all
+data after the unreadable byte.
+.PP
+But be aware that an image file is sometimes too small because of a
+bug in the program that generated it, and in that case it is not
+simply a matter of the bottom of the image missing, so
+\fBpamfix\fP simply creates a valid Netpbm image containing a
+garbage picture.
+.PP
+If you want to test an image file to see if it is corrupted by being
+too small, use \fBpamfile --allimages\fP .  It fails with an error
+message if the file is too small.
+.PP
+If you want to cut the bottom off a valid Netpbm image, use
+\fBpamcut\fP.
+
+
+.UN excessivesample
+.SS Excessive Sample Value
+.PP
+This is a stream that contains a purported sample value that is higher than
+the maxval of the image.
+.PP
+The header of a Netpbm image tells the maxval of the image, which is a
+value that gives meaning to all the sample values in the raster.  The
+sample values represent a fraction of the maxval, so a sample value that is
+greater than the maxval makes no sense.
+.PP
+A regular Netpbm program fails if you give it input that contains a value
+larger than the maxval where a sample value belongs.
+.PP
+\fBpamfix\fP has three ways of salvaging such a stream:
+
+
+.IP \(bu
+Clip to the maxval.  Request this with \fB-clip\fP.
+.IP \(bu
+Raise the maxval, thus lowering the fraction represented by every sample
+in the image.  Request this with \fB-changemaxval\fP.
+.IP \(bu
+Truncate the image at the first invalid sample value.  Request this with
+\fB-truncate\fP and neither \fB-clip\fP nor \fB-changemaxval\fP.
+
+.PP
+You cannot specify both \fB-clip\fP and \fB-changemaxval\fP.
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pnm" (5)\c
+\&,
+.BR "pam" (5)\c
+\&,
+.BR "pamcut" (1)\c
+\&,
+.BR "pamfile" (1)\c
+\&,
+
+.UN history
+.SH HISTORY
+.PP
+\fBpamfix\fP was new in Netpbm 10.66 (March 2014).  But it grew out of
+\fBpamfixtrunc\fP, which was new in Netpbm 10.38 (March 2007) and did only
+the truncated image repair (and for invalid sample values would simply pass
+them through to its output, generating an invalid Netpbm image).
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source.  The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/pamfix.html
+.PP
+\ No newline at end of file