NetPBM Image Manipulation Routines
The NETPBM package contains routines which can be used to manipulate a set of standard image formats. The image formats are pbm, pgm, and ppm, for portable bitmap, graymap and pixmap, respectively. The bitmap format is black and white, the graymap add shades of gray, and the pixmap has color. The name "pnm" is used to refer to any of the formats. Images of any type can be manipulated by first translating them into a pnm format. To translate to a pnm format see The NETPBM Image Conversion Routines help page.
At this time, the most help you can get for running an individual routine is to type its name followed by "-h". Most will then print out a usage statement. The ones that don't will at least complain enough so that you will know what it wanted in the first place.
Program |
Purpose |
|---|---|
| pbmclean |
Flip isolated pixels in a bitmap |
| pbmlife |
Apply Conway's rules of Life to a portable bitmap |
| pbmmake |
Create a blank bitmap of a specified size |
| pbmmask |
Create a mask bitmap from a regular bitmap |
| pbmpscale |
Enlarge a pbm image with edge smoothing |
| pbmreduce |
Read a portable bitmap and reduce it N times |
| pbmupc |
Create a Universal Product Code bitmap |
| pgmbentley |
Bentleyize a portable graymap |
| pgmcrater |
Create cratered terrain by fractal forgery |
| pbmedge |
Edge-detect a portable graymap |
| pgmenhance |
Edge-enhance a portable graymap |
| pgmhist |
Print a histogram of the values in a portable graymap |
| pgmkernel |
Generate a convolution kernel (for pnmconvol use) |
| pgmnoice |
Create a PGM made up of white noise |
| pgmnorm |
Normalize the contrast in a portable graymap |
| pgmoil |
Turn a portable graymap into an oil painting |
| pgmramp |
Generate a grayscale ramp |
| pgmtexture |
Calculate textural features on a portable graymap |
| pnmalias |
Anti-alias a PNM (remove jagged lines) |
| pnmarith |
Perform arithmetic on two portable anymaps |
| pnmcat |
Concatenate portable anymaps |
| pnmcomp |
Create composite image from two PNMs |
| pnmconvol |
General MxN convolution on a portable anymap |
| pnmcrop |
Crop a portable anymap |
| pnmcut |
Cut a rectangle out of a portable anymap |
| pnmdepth |
Change the maxval in a portable anymap |
| pnmenlarge |
Read a portable anymap and enlarge it N times |
| pnmfile |
Describe a portable anymap |
| pnmflip |
Perform one or more flip operations on a portable anymap |
| pnmgamma |
Perform gamma correction on a portable anymap |
| pnmhisteq |
Histogram-equalize a PNM |
| pnmhistmap |
Draw a histrogram for a PGm or PPM file |
| pnmindex |
Build a visual index of a bunch of anymaps |
| pnminvert |
Invert a portable anymap |
| pnmmargin |
Add a border to a portable anymap |
| pnmnlfilt |
Miscellaneous non-linear filters |
| pnmnoraw |
Force a portable anymap into plain format |
| pnmpad |
Add borders to a PNM |
| pnmpaste |
Paste a rectable into a portable anymap |
| pnmrotate |
Rotate a portable anymap by some angle |
| pnmscale |
Scale a protable anymap |
| pnmshear |
Shear a portable anymap by some angle |
| pnmtile |
Smooth out an image |
| ppm3d |
Merge two PPM files into a red/boue (3-D galsses) PPM |
| ppmbrighten |
Change image saturation and value on an HSV map |
| ppmchange |
Change one color into another color |
| ppmdim |
Dim a portable pixmap (similar to ppmbrighten) |
| ppmdither |
Simplistic grayscale convert for color images |
| ppmflash |
Brighten a picuture (similar to ppmbrighten) |
| ppmforge |
Fractal forgeries of clouds, planets, and starry skies |
| ppmhist |
Print a histogram of a portable pixmap |
| ppmmake |
Create a pixmap of a specified size and color |
| ppmtomap |
Extract all colors from a ppm file |
| ppmmix |
Blend together two portable pixmaps (fade between) |
| ppmnorm |
Normalize the contrast in a portable pixmap |
| ppmntsc |
Make PPM look like a television image (dim every other row) |
| ppmpat |
Make a pretty pixmap |
| ppmquant |
Quantize the colors in a portable pixmap down to a specified number |
| ppmquantall |
Run ppmquant on a bunch of files all at once, so they share a common color map |
| ppmqvga |
Eight plane quantization |
| ppmrelief |
Run a Paplacian relief filter on a portable pixmap |
| ppmshift |
Shift rows randomly left and right (water reflection). |
| ppmspread |
Displace pixels by random amounts (unfocus image). |