Section 1: user commands and tools
NAME pnmsplit – split a multi-image portable anymap into multiple single-image files SYNOPSIS pnmsplit [pnmfile[ output_file_pattern]] DESCRIPTION Reads a Netpbm file as input. Copies each image in the input into a separate file, in the same format. pnmfile is the file specification of the input file, or – to indicate Standard Input. The default is…
NAME pnmsmooth – smooth out an image SYNOPSIS pnmsmooth [-size width height] [-dump dumpfile] [pnmfile] DESCRIPTION Smooths out an image by replacing each pixel with the average of its width X height neighbors. It is implemented as a C progam that generates a PGM convolution matrix and then invokes pnmconvol. OPTIONS -size width height Specifies…
NAME pnmshear – shear a portable anymap by some angle SYNOPSIS pnmshear [-noantialias] angle [pnmfile] DESCRIPTION Reads a portable anymap as input. Shears 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…
NAME pnmscalefixed – scale a portable anymap quickly, but less accurate DESCRIPTION pnmscalefixed is the same thing as pnmscale except that it uses fixed point arithmetic internally instead of floating point, which makes it run faster. In turn, it is less accurate and may distort the image. Use the pnmscale man page with pnmscalefixed. This…
NAME pnmscale – scale a portable anymap SYNOPSIS pnmscale scale_factor [pnmfile] pnmscale -reduce reduction_factor [pnmfile] pnmscale [{-xsize=cols | -width=cols | -xscale=factor}] [{-ysize=rows | -height=rows | -yscale=factor}] [pnmfile] pnmscale -xysize cols rows [pnmfile] pnmscale -pixels n [pnmfile] Miscellaneous options: -verbose -nomix Minimum unique abbreviation of option is acceptable. You may use double hypens instead of single…
NAME pnmrotate – rotate a portable anymap by some angle SYNOPSIS pnmrotate [-noantialias] angle [pnmfile] DESCRIPTION Reads 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…
NAME pnmremap – replace colors in a PPM image with colors from another set SYNOPSIS pnmremap [-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…
NAME pnmquantall – run Pnmquant on a bunch of files all at once, so they share a common colormap SYNOPSIS pnmquantall [-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…
NAME pnmquant – quantize the colors in a Netpbm image to a smaller set SYNOPSIS pnmquant [-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…
NAME pnmpsnr – compute the difference between two portable anymaps SYNOPSIS pnmpsnr [pnmfile1] [pnmfile2] DESCRIPTION Reads 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…
NAME pnmpaste – paste a rectangle into a portable anymap SYNOPSIS pnmpaste [-replace|-or|-and |-xor] frompnmfile x y [intopnmfile] DESCRIPTION Reads 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…
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…