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.
pnmrotate – rotate a portable anymap by some angle Synopsispnmrotate [-noantialias] angle [pnmfile] DescriptionReads a portable anymap as input. Rotates it by the specified angle and produces a portable anymap as output. If the input file is in color, the output will be too, otherwise it will be grayscale. The angle is in degrees (floating…
pnmremap – replace colors in a PPM image with colors from another set Synopsispnmremap [-floyd|-fs|-nfloyd|-nofs] [-firstisdefault] [-verbose] [-mapfile=mapfile] [-missingcolor=color] [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 between an option…
pnmquantall – run Pnmquant on a bunch of files all at once, so they share a common colormap Synopsispnmquantall [-ext extension] ncolors netpbm_file… Note that the usual syntax rules for Netpbm programs don’t apply to this program. For example, you can’t abbreviation -ext and you can’t put it anywhere on the line you want. DescriptionThis…
pnmquant – quantize the colors in a Netpbm image to a smaller set Synopsispnmquant [-center|-meancolor|-meanpixel] [-floyd|-fs] [-nofloyd|-nofs] [-spreadbrightness|-spreadluminosity] ncolors [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 equals signs between an option name…
pnmpsnr – compute the difference between two portable anymaps Synopsispnmpsnr [pnmfile1] [pnmfile2] DescriptionReads two PBM, PGM, or PPM files, or PAM equivalents, as input. Prints the peak signal-to-noise ratio (PSNR) difference between the two images. This metric is typically used in image compression papers to rate the distortion between original and decoded image. If the…
pnmpaste – paste a rectangle into a portable anymap Synopsispnmpaste [-replace|-or|-and |-xor] frompnmfile x y [intopnmfile] DescriptionReads two portable anymaps as input. Inserts the first anymap into the second at the specified location, and produces a portable anymap the same size as the second as output. If the second anymap is not specified, it is…
pnmpad – add borders to portable anymap Synopsispnmpad [-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 between an…
pnmnorm – normalize the contrast in a Netbpm image Synopsispnmnorm [-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 equals sign…
pnmtoplainpnm – convert portable any map to plain (ASCII) anymap format Synopsispnmtoplainpnm [pnmfile] DescriptionReads 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 generates the one…
pnmnlfilt – non-linear filters: smooth, alpha trim mean, optimal estimation smoothing, edge enhancement. Synopsispnmnlfilt alpha radius [pnmfile] Descriptionpnmnlfilt 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 knife filter. It…
pnmmontage – create a montage of portable anymaps Synopsispnmmontage [-?|-help] [-header=headerfile] [-quality=n] [-prefix=prefix] [-0|-1|-2|…|-9] pnmfile… DescriptionPacks 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 pnmmontage to write a…
pnmmercator – transform a worldmap from rectangular projection to Mercator projection and vice-versa Synopsispnmmercator [-inverse] [-nomix] [-[v]verbose] [filename] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. DescriptionThis program is part of Netpbm(1) The pnmmercator utility, converts a rectangular projection worldmap to a Mercator projection…
pnmmargin – add a border to a portable anymap Synopsispnmmargin [-white|-black|-color colorspec] size [pnmfile] DescriptionReads a portable anymap as input. Adds a border of the specified number of pixels, and produces a portable anymap as output. OptionsYou can specify the border color with the -white, -black, and -color flags. If no color is specified, the…
pnminvert – invert a portable anymap Synopsispnminvert [pnmfile] DescriptionReads a portable anymap as input. Inverts it black for white and produces a portable anymap as output. See Alsopnm(5) AuthorCopyright (C) 1989 by Jef Poskanzer.
pamstretch – scale up a PNM or PAM image by interpolating between pixels Synopsispamstretch [-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 equals sign….
pamstretch-gen – use pamstretch and pnmscale to scale by non-integer values Synopsispamstretch-gen N [pnmfile] Descriptionpamstretch-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, it’s much the…
pnmindex – build a visual index of a bunch of anymaps Synopsispnmindex [-size N] [-across N] [-colors N] [-black] [-title T] [-quant|-noquant] pnmfile … Descriptionpnmindex 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 N The size of…
pnmhistmap – draw a histogram for a PGM or PPM file Synopsispnmhistmap [-black] [-white] [-max N] [-verbose] [pnmfile] DescriptionReads 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 (PGM) input produces…
pnmhisteq – histogram equalise a portable anymap Synopsispnmhisteq [-gray] [-rmap pgmfile] [-wmap pgmfile] [-verbose] [pnmfile] Descriptionpnmhisteq 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 spreads out intensity…
pnmgamma – perform gamma correction on a portable anymap Synopsispnmgamma [-ungamma] [-cieramp|-srgbramp] [value [pnmfile]] pnmgamma [-ungamma] [-cieramp|-srgbramp] redgamma greengamma bluegamma [pnmfile] DescriptionPerforms 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 sample values are…