Pammixmulti User Manual(1) General Commands Manual Pammixmulti User Manual(1)
NAME
pammixmulti - blend together multiple PAM images
SYNOPSIS
pammixmulti
[--blend=average|random|mask]
[--maskfile=filename]
[--stdev=number]
[--randomseed integer]
filename ...
Minimum unique abbreviation of an option is acceptable. You can use a
single hyphen instead of double hyphens to denote options. You can use
white space in place of the equals sign to separate an option name from
its value.
DESCRIPTION
This file is part of Netpbm(1).
pammixmulti mixes two or more images to produce a new image. The pro-
gram provides multiple ways to interpret "mix."
OPTIONS
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), pammixmulti recognizes
the following command line options:
--blend=average|random|mask
This option specifies how the input images should be mixed to
produce the output image. With --blend=average (the default),
each pixel in the output is produced by averaging the corre-
sponding pixels from all the input images. With --blend=random,
each pixel in the output is produced by selecting the corre-
sponding pixel from one of the input images, chosen at random on
a per-pixel basis. With --blend=mask, each pixel in the output
is produced by a weighted average of the corresponding pixels
from all the input images based on the grayscale level of an ad-
ditional mask image.
--maskfile=filename
In conjunction with --blend=mask, this option names a grayscale
mask file to control the blending of each pixel. (If the file
is not grayscale, the first channel is treated as gray). Where
the mask file is black, the first image is selected. Where the
mask file is white, the last image is selected. Intermediate
levels of gray select intermediate images.
--stdev=number
When used with --blend=mask, this option controls how smoothly
the various input images are mixed to produce each output pixel.
For example, consider running pammixmulti with three input im-
ages and a mask image that uses gray levels from 0 to 255. Given
--stdev=0.0, gray levels 0-84 produce exclusively image 1; gray
levels 85-170 produce exclusively image 2; and gray levels
171-255 produce exclusively image 3. If the argument to --stdev
is positive, images are blended according to a normal distribu-
tion. Hence, gray levels around 85 produce an output pixel that
includes roughly equal amounts of the corresponding pixel from
images 1 and 2 but less of the corresponding pixel from image 3.
As number tends towards the number of input images (going beyond
that has diminishing impact), the output tends to look more like
--blend=average. number defaults to 0.25.
--randomseed integer
This is the seed for the random number generator used with
--blend=random
Use this to ensure you get the same image on separate invoca-
tions.
ARGUMENTS
You supply the names of the files to mix as non-option arguments.
EXAMPLES
Average a bunch of PPM images to produce a new PAM image:
pammixmulti input*.ppm >output.ppm
Mix these same images by taking each pixel from a randomly selected in-
put image:
pammixmulti --blend=random input*.ppm >output.ppm
Use a mask image to control the fading among input images on a pixel-
by-pixel basis:
pammixmulti --blend=mask --maskfile=mask.pgm >output.pam \
one.pam two.pam three.pam four.pam
Do the same but with more abrupt transitions:
pammixmulti --blend=mask --maskfile=mask.pgm --stdev=0.0 >output.pam \
one.pam two.pam three.pam four.pam
and now with more gradual transitions:
pammixmulti --blend=mask --maskfile=mask.pgm --stdev=1.0 >output.pam \
one.pam two.pam three.pam four.pam
HISTORY
pammixmulti was new in Netpbm 10.85 (December 2018).
AUTHOR
Copyright 2018 Scott Pakin, scott+pbm@pakin.org.
SEE ALSO
pamcomp(1), ppmmix(1), pamarith(1), pnm(1), pam(1)
Table Of Contents
•
SYNOPSIS ⟨#synopsis⟩
•
DESCRIPTION ⟨#description⟩
•
OPTIONS ⟨#options⟩
•
ARGUMENTS ⟨#arguments⟩
•
EXAMPLES ⟨#examples⟩
•
HISTORY ⟨#history⟩
•
AUTHOR ⟨#author⟩
•
SEE ALSO ⟨#seealso⟩
DOCUMENT SOURCE
This manual page was generated by the Netpbm tool 'makeman' from HTML
source. The master documentation is at
http://netpbm.sourceforge.net/doc/pammixmulti.html
netpbm documentation 18 November 2018 Pammixmulti User Manual(1)
Generated by dwww version 1.15 on Sat Jun 29 02:40:01 CEST 2024.