Adding upstream version 4.22.0.upstream/4.22.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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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 "Ppmmix User Manual" 0 "23 March 2010" "netpbm documentation"
+
+.SH NAME
+
+ppmmix - blend together two PPM images
+
+.UN synopsis
+.SH SYNOPSIS
+
+ppmmix \fIfadefactor\fP \fIppmfile1\fP \fIppmfile2\fP
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBppmmix\fP reads two PPM images as input and mixes them together
+using the specified fade factor.  The fade factor may be in the range
+from 0.0 (only ppmfile1's image data) to 1.0 (only ppmfile2's image
+data).  Anything in between specifies a smooth blend between the two
+images.
+.PP
+The two images must have the same dimensions and the same maxval.  Before
+Netpbm 10.54 (March 2011), they must also have the same type (PBM/PGM/PPM).
+.PP
+The fade factor is applied to brightness, not light intensity.  That means
+for example that if you have a series of images you generated
+using \fBppmmix\fP of a black and a white image with a linearly increasing
+fade factor, you will see an image getting linearly brighter, but the light
+intensity will increase faster at the end.  That is because it requires more
+intensity change at the bright end of the scale than at the dark end for the
+human eye to perceive the same brightness change.  This also means that
+if the original images aren't all one color, the mixed image is distorted,
+since the intensity relationship between pixels is different from the
+original image.
+.PP
+\fBpamcomp\fP is a more general alternative.  It allows you to mix
+images of different size and to have the fade factor vary throughout
+the image (through the use of a transparency mask).  It does not have the
+same-maxval and same-type restrictions.  It mixes light intensity, not
+brightness.
+
+.UN seealso
+.SH SEE ALSO
+.BR "pamcomp" (1)\c
+\&,
+.BR "ppm" (5)\c
+\&
+
+.UN author
+.SH AUTHOR
+
+Copyright (C) 1993 by Frank Neumann
+.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/ppmmix.html
+.PP
\ No newline at end of file