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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 "PamRubber User Manual" 0 "February 2011" "netpbm documentation"
+
+
+
+
+.PP
+.SH NAME 
+pamrubber - a rubber-sheeting utility that stretches an image
+based on control points
+
+.UN synopsis
+.SH SYNOPSIS
+\fBpamrubber\fP
+{\fB-tri | -quad\fP}
+[\fB-linear\fP]
+[\fB-frame\fP]
+[\fB-randomseed=\fP\fIN\fP]
+\fIcp1x cp1y\fP [\fIcp2x cp2y\fP [\fIcp3x cp3y\fP [\fIcp4x cp4y\fP]]]
+\fIcp1x cp1y\fP [\fIcp2x cp2y\fP [\fIcp3x cp3y\fP [\fIcp4x cp4y\fP]]]
+[\fIfilename\fP]
+.PP
+Minimum unique abbreviation of options is acceptable.  You may use double
+hyphens instead of single hyphen to denote options.
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part
+of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+The \fBpamrubber\fP utility converts a pam image into a new image with the
+contents moved around.  The transformation is often called "rubber
+sheeting": you identify control points (CP) on the source image and
+specify new positions for those points in the new image.  \fBpamrubber\fP
+moves all the pixels around, stretching and compressing as necessary, as
+if the original image were on a sheet of rubber and you pulled on the sheet
+to make the control points move to their new locations.
+.PP
+The new image has the same dimensions and format as the original.
+.PP
+The transformation can happen in two very different ways, called
+"quad" and "tri." With the former, you must specify four
+control points (for both source and target).  These are the corners of two
+quadrilaterals that will act as the coordinate system for both source and
+target images.  Consider them as non-orthogonal (0,0), (0,1), (1,0) and (1,1)
+points.  This transformation comes close to the one \fBpamperspective\fP
+does, however that program does other corrections as well.
+.PP
+When you specify less than four control points, the program adds control
+points in the following way.  With three control points, \fBpamrubber\fP
+chooses the fourth one such that the four points form a parallelogram.  With
+two points, \fBpamrubber\fP considers them the opposite corners of a
+rectangle.  When you specify only one control point, \fBpamrubber\fP uses a
+rectangle from the top left corner of the image to the single control
+point.
+.PP
+In "tri" mode, \fBpamrubber\fP conceptually cuts up the source
+and target image into triangles.  It Transforms within each corresponding pair
+of triangles in a stretching fashion.  It's like pulling on the three corners
+of the triangle.  In this mode, each pixel in the source image gets mapped to
+a position in the target image. No pixels are lost.
+.PP
+When, in "tri" mode, you specify only a single control point in
+the source and target image, \fBpamrubber\fP creates four triangles from this
+point to the four corners of the image. With two points, the program creates
+six triangles from the two endpoints of the line connecting the two points,
+again to the four corners of the image. Three control points is in a way the
+core of this utility in "tri" mode.  Between the three edges of the
+central triangle and the four edges of the image, \fBpamrubber\fP constructs
+another seven triangles.  Four control points define two central connected
+triangles.  In total this results in cutting the source and target image up
+into ten triangles.
+.PP
+In this case clearly a picture says more than a thousand words.  There is a
+graphical illustration of these various modes at
+.UR http://www.schaik.com/netpbm/rubber
+ www.schaik.com/netpbm/rubber
+.UE
+\&.  An example of how to use this type of
+rubber sheeting in cartography is in the article
+.UR http://www.isprs.org/proceedings/XXXVI/5-W1/papers/21.pdf
+ Visualizing the Landscape of Old-Time Tokyo
+.UE
+\&.
+
+
+.UN parameters
+.SH PARAMETERS
+.PP
+The parameters are control points (\fIcp\fP) in pairs of \fIx\fP
+and \fIy\fP.  The source and target image must have the same number of
+control points.  The minimum number of values specified here is 4 for a single
+control point in the source and target image.  The maximum is 16 for four
+control points in each image.
+
+.PP
+\fIfilename\fP is the name of the input file. If you don't specify
+this, \fBpamrubber\fP reads the image from Standard Input.
+
+
+.UN options
+.SH OPTIONS
+
+
+.TP
+\fB-tri\fP | \fB-quad\fP
+.sp
+This selects the type of rubber sheeting done.
+You must specify exactly one of these options.
+
+
+.TP
+\fB-linear\fP
+.sp
+This determines whether \fBpamrubber\fP uses nearest neighbor
+interpolation or bilinear interpolation of four source pixels.
+
+
+
+.TP
+\fB-frame\fP
+.sp
+This option causes \fBpamrubber\fP to overlay the target image with the
+edges of the quadrilaterals, respectively the triangles used for the rubber
+sheeting.  To get the same overlay for the source image, use a \fBpamrubber\fP
+transformation with identical control points for source and target.
+
+
+.TP
+\fB-randomseed=\fP\fIN\fP
+.sp
+\fBpamrubber\fP randomizes some of its output.  So that you can produce
+repeatable results, you can choose the seed of the random number generator
+with this option.  If you use the same input image and the same random number
+generator seed, you should always get the exact same output.  By default,
+\fBpamrubber\fP uses the time of day as the seed, so you get slightly
+different output when you run the program twice on the same input.
+.sp
+Before Netpbm 10.61 (December 2012), this was called \fB-randseed\fP,
+and that still works.
+
+
+
+
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "pam" (1)\c
+\& and
+.BR "pamperspective" (1)\c
+\&
+
+
+.UN history
+.SH HISTORY
+.PP
+\fBpamrubber\fP was new in Netpbm 10.54 (March 2011).
+
+
+.UN authors
+.SH AUTHORS
+.PP
+\fIWillem van Schaik\fP wrote this program
+in February 2011 and contributed it to Netpbm.
+.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/pamrubber.html
+.PP
+\ No newline at end of file