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.
pgmtopgm – copy PGM image Synopsispgmtopgm DescriptionThis program is part of Netpbm(1) pgmtopgm simply copies a PGM image from Standard Input to Standard Output. This may seem an unnecessary duplication of cat, but remember that a PGM program can read a PBM image as if it were PGM. So pgmtopgm can read either a PBM…
pgmtopbm – convert a portable graymap into a portable bitmap Synopsispgmtopbm [-floyd|-fs|-threshold |-hilbert |-dither8|-d8|-cluster3 |-c3|-cluster4|-c4 |-cluster8|-c8] [-value val] [-clump size] [pgmfile] DescriptionReads a portable graymap as input. Produces a portable bitmap as output. Note that there is no pbmtopgm converter. Any program that uses the Netpbm libraries to read PGM files, including virtually all programs…
pgmtolispm – convert a portable graymap into Lisp Machine format Synopsispgmtolispm [pgmfile] DescriptionReads a portable graymap as input. Produces a Lisp Machine bitmap as output. This is the file format read by the tv:read-bit-array-file function on TI Explorer and Symbolics lisp machines. Given a pgm (instead of a pbm) a multi-plane image will be output….
pgmtofs – convert portable graymap to Usenix FaceSaver(tm) format Synopsispgmtofs [pgmfile] DescriptionReads a portable graymap as input. Produces Usenix FaceSaver(tm) format as output. FaceSaver is a registered trademark of Metron Computerware Ltd. of Oakland, CA. See Alsofstopgm(1), pgm(5) AuthorCopyright (C) 1991 by Jef Poskanzer.
pgmtexture – calculate textural features on a portable graymap Synopsispgmtexture [-d d] [pgmfile] DescriptionReads a portable graymap as input. Calculates textural features based on spatial dependence matrices at 0, 45, 90, and 135 degrees for a distance d (default = 1). Textural features include: (1) Angular Second Moment, (2) Contrast, (3) Correlation, (4) Variance, (5)…
pgmslice – extract one line of pixel values out of a portable graymap Synopsispgmslice -row|-col line [pgmfile] DescriptionExtracts one line of pixel values out of a portable graymap and outputs it in a two column ascii format, with the first value being the pixel’s position in the line and the second value the pixel’s greyscale…
pgmramp – generate a grayscale ramp Synopsispgmramp -lr|-tb | -rectangle|-ellipse width height DescriptionGenerates a graymap of the specified size containing a black-to-white ramp. These ramps are useful for multiplying with other images, using the pnmarith tool. Options-lr A left to right ramp. -tb A top to bottom ramp. -rectangle A rectangular ramp. -ellipse An elliptical…
pamoil – turn a PAM image into an oil painting Synopsispamoil [-n N] [pamfile] DescriptionReads a Netpbm image as input. Does an "oil transfer", and writes the same type of Netpbm image as output. The oil transfer is described in "Beyond Photography" by Holzmann, chapter 4, photo 7. It’s a sort of localized smearing. The…
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…
pgmnoise – create a graymap made up of white noise Synopsispgmnoise width height DescriptionCreates a portable graymap that is made up of random pixels with gray values in the range of 0 to PGM_MAXMAXVAL (depends on the compilation, either 255 or 65535). The graymap has a size of width * height pixels. See Alsopgm(5) AuthorCopyright…
pgmmorphconv – perform morphological convolutions: dilation, erosion Synopsispgmmorphconv [ -erode | -dilate | -open | -close ] templatefile [pgmfile] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from…
pgmminkowski – compute Minkowski integral Synopsispgmminkowski pgmfile DescriptionThis program is part of Netpbm(1) pgmminkowski computes the 3 Minkowski integrals of a PGM image. The Minkowski integrals mathematically characterize the shapes in the image and hence are the basis of "morphological image analysis." Hadwiger’s theorem has it that these integrals are the only motion-invariant, additive and…
pgmmedian – apply a median filter to a PGM file Synopsispgmmedian [-width=n] [-height=n] [-type=median_type] [-cutoff=int] [pnmfile] Minimum unique abbreviation of option is acceptable. You may use double hyphens instead of single hyphen to denote options. You may use white space in place of the equals sign to separate an option name from its value. DescriptionThis…
pgmmake – create a PGM image of a specified gray level and dimensions Synopsispgmmake [-maxval=maxval] graylevel width height 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 name and…
pgmkernel – generate a convolution kernel Synopsispgmkernel [ -weight w ] width [ height ] DescriptionGenerates a portable graymap array of size width x height (or width x width if height is not specified) to be used as a convolution file by pnmconvol. The data in the convolution array K are computed according to the…
pgmhist – print a histogram of the values in a portable graymap Synopsispgmhist [pgmfile] DescriptionReads a portable graymap as input. Prints a histogram of the gray values. See Alsopgmnorm(1), pgm(5), ppmhist(1) AuthorCopyright (C) 1989 by Jef Poskanzer.
pgmenhance – edge-enhance a portable graymap Synopsispgmenhance [-N] [pgmfile] DescriptionReads a portable graymap as input. Enhances the edges, and writes a portable graymap as output. The edge enhancing technique is taken from Philip R. Thompson’s "xim" program, which in turn took it from section 6 of "Digital Halftones by Dot Diffusion", D. E. Knuth, ACM…
pgmedge – edge-detect a portable graymap Synopsispgmedge [pgmfile] DescriptionReads a portable graymap as input. Outlines the edges, and writes a portable graymap as output. Piping the result through pgmtopbm -threshold and playing with the threshold value will give a bitmap of the edges. The edge detection technique used is to take the Pythagorean sum of…
pgmdeshadow – Deshadow a PGM image Synopsispgmdeshadow [pnmfile] DescriptionThis program is part of Netpbm(1) pgmdeshadow removes gray shadows from an image. This is useful for an image containing text, such as a scanned book pages, where a shadow typically appears near the book crease or near one side of the image. pgmdeshadow recognizes a gray…
pgmcrater – create cratered terrain by fractal forgery Synopsispgmcrater [-number n] [-height|-ysize s] [-width|-xsize s] [-gamma g] All options can be abbreviated to their shortest unique prefix. Descriptionpgmcrater creates a PGM image which mimics cratered terrain. The PGM image is created by simulating the impact of a given number of craters with random position…