The Linux Manuals (man pages) document is an important part of Linux documents. Linux Manuals are organized as several sections. Each section has a group of commands for a specific area in Linux usage, administration or development.
NAME pnmpad – add borders to portable anymap SYNOPSIS pnmpad [-verbose] [-white|-black] [[[-width=width [-halign=ratio]] | [-left=leftpad] [-right=rightpad]]] [[[-height=height [-valign=ratio]] | [-top=toppad] [-bottom=botpad]]] [pnmfile] All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one to designate an option. You may use either white space or an equals sign…
NAME pnmnorm – normalize the contrast in a Netbpm image SYNOPSIS pnmnorm [-bpercent N | -bvalue N] [-wpercent N | -wvalue N] [-keephues] [-brightmax] [ppmfile] All options can be abbreviated to their shortest unique prefix. You may use two hyphens instead of one to designate an option. You may use either white space or an…
NAME pnmtoplainpnm – convert portable any map to plain (ASCII) anymap format SYNOPSIS pnmtoplainpnm [pnmfile] DESCRIPTION Reads a portable anymap as input, either from the named file or if no file named, from Standard Input. Writes out the image in plain (ASCII) anymap format to Standard Output. Of the three plain anymap formats, this program…
NAME pnmnlfilt – non-linear filters: smooth, alpha trim mean, optimal estimation smoothing, edge enhancement. SYNOPSIS pnmnlfilt alpha radius [pnmfile] DESCRIPTION pnmnlfilt produces an output image where the pixels are a summary of multiple pixels near the corresponding location in an input image. This program works on multi-image streams. This is something of a swiss army…
NAME pnmmontage – create a montage of portable anymaps SYNOPSIS pnmmontage [-?|-help] [-header=headerfile] [-quality=n] [-prefix=prefix] [-0|-1|-2|…|-9] pnmfile… DESCRIPTION Packs images of differing sizes into a minimum-area composite image, optionally producing a C header file with the locations of the subimages within the composite image. OPTIONS -?, -help Displays a (very) short usage message. -header Tells…
NAME pnmmercator – transform a worldmap from rectangular projection to Mercator projection and vice-versa SYNOPSIS pnmmercator [-inverse] [-nomix] [-[v]verbose] [filename] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. DESCRIPTION This program is part of Netpbm(1) The pnmmercator utility, converts a rectangular projection worldmap to…
NAME pnmmargin – add a border to a portable anymap SYNOPSIS pnmmargin [-white|-black|-color colorspec] size [pnmfile] DESCRIPTION Reads a portable anymap as input. Adds a border of the specified number of pixels, and produces a portable anymap as output. OPTIONS You can specify the border color with the -white, -black, and -color flags. If no…
NAME pnminvert – invert a portable anymap SYNOPSIS pnminvert [pnmfile] DESCRIPTION Reads a portable anymap as input. Inverts it black for white and produces a portable anymap as output. SEE ALSO pnm(5) AUTHOR Copyright (C) 1989 by Jef Poskanzer. Index
NAME pamstretch – scale up a PNM or PAM image by interpolating between pixels SYNOPSIS pamstretch [-xscale=X] [-yscale=Y] [-blackedge] [-dropedge] N [infile] You can use the minimum unique abbreviation of the options. You can use two hyphens instead of one. You can separate an option name from its value with white space instead of an…
NAME pamstretch-gen – use pamstretch and pnmscale to scale by non-integer values SYNOPSIS pamstretch-gen N [pnmfile] DESCRIPTION pamstretch-gen is a program which uses pamstretch(1), pnmfile(1), and pnmscale(1) to smoothly scale up a PNM file by any ratio; it’s like a more general version of pamstretch (hence the name). But other than the `any ratio’ bit,…
NAME pnmindex – build a visual index of a bunch of anymaps SYNOPSIS pnmindex [-size N] [-across N] [-colors N] [-black] [-title T] [-quant|-noquant] pnmfile … DESCRIPTION pnmindex creates an index image containing thumbnail (small) versions of a bunch of PNM files you supply. pnmindex labels each thumbnail and, optionally, contains a title. OPTIONS -size…
NAME pnmhistmap – draw a histogram for a PGM or PPM file SYNOPSIS pnmhistmap [-black] [-white] [-max N] [-verbose] [pnmfile] DESCRIPTION Reads a portable anymap as input, although bitmap (PBM) input produces an error message and no image. Produces an image showing a histogram of the color (or gray) values in the input. A graymap…
NAME pnmhisteq – histogram equalise a portable anymap SYNOPSIS pnmhisteq [-gray] [-rmap pgmfile] [-wmap pgmfile] [-verbose] [pnmfile] DESCRIPTION pnmhisteq increases the contrast of a portable graymap or pixmap through the technique of histogram equalisation[1]. A histogram of the luminance of pixels in the map is computed, from which a transfer function is calculated which…
NAME pnmgamma – perform gamma correction on a portable anymap SYNOPSIS pnmgamma [-ungamma] [-cieramp|-srgbramp] [value [pnmfile]] pnmgamma [-ungamma] [-cieramp|-srgbramp] redgamma greengamma bluegamma [pnmfile] DESCRIPTION Performs gamma correction on pseudo-PNM images. The PPM format specification specify that certain sample values in a file represent certain light intensities in an image. In particular, they specify that the…
NAME pnmflip – perform one or more flip operations on a portable anymap SYNOPSIS pnmflip [-leftright|-lr] [-topbottom|-tb] [-transpose|-xy] [-rotate90|-r90|-ccw ] [-rotate270|-r270|-cw ] [-rotate180|-r180] [pnmfile] DESCRIPTION Reads a portable anymap as input. Performs one or more flip operations, in the order specified, and writes out a portable anymap. OPTIONS The flip operations available are: left for…
NAME pnmfile – describe a portable anymap SYNOPSIS pnmfile [-allimages] [pnmfile …] DESCRIPTION Reads one or more Netpbm files as input. Writes out short descriptions of the image type, size, etc. This is mostly for use in shell scripts, so the format is not particularly pretty. OPTIONS -allimages Describe every image in each input file….
NAME pnmenlarge – read a portable anymap and enlarge it N times SYNOPSIS pnmenlarge N [pnmfile] DESCRIPTION Reads a portable anymap as input. Replicates its pixels N times, and produces a portable anymap as output. pnmenlarge can only enlarge by integer factors. The slower but more general pnmscale can enlarge or reduce by arbitrary factors,…
NAME pnmdepth – change the maxval in a portable anymap SYNOPSIS pnmdepth newmaxval [pnmfile] DESCRIPTION Reads a portable anymap as input. Scales all the pixel values, and writes out the image with the new maxval. Scaling the colors down to a smaller maxval will result in some loss of information. Be careful of off-by-one errors…
NAME pnmcut – cut a rectangle out of a portable anymap SYNOPSIS pnmcut [-left leftcol] [-right rightcol] [-top toprow] [-bottom bottomrow] [-width width] [-height height] [-pad] [-verbose] [ left top width height ] [pnmfile] All options may be abbreviated to the shortest unique prefix. DESCRIPTION Reads a PBM, PGM, or PPM image as input. Extracts…
NAME pnmcrop – crop a portable anymap SYNOPSIS pnmcrop [-white|-black|-sides] [-left] [-right] [-top] [-bottom] [pnmfile] All options may be abbreviated to their shortest unique prefix or specified with double hyphens. DESCRIPTION Reads a PBM, PGM, or PPM image as input. Removes borders that are the background color, and produces the same type of image as…