Linux Commands Examples

A great documentation place for Linux commands


convert portable bitmap to portable graymap by averaging areas

see also : pgmtopbm


pbmtopgm width height [pbmfile]

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pbmtopgm reads a portable bitmap as input. It outputs a portable graymap in which each pixel’s gray level is the average the surrounding black and white input pixels. The surrounding area is a rectangle of width by height pixels.

In other words, this is a convolution. pbmtopgm is similar to a special case of pnmconvol.

You may need a ppmsmooth step after pbmtopgm.

pbmtopgm has the effect of anti-aliasing bitmaps which contain distinct line features.

pbmtopgm works best with odd sample width and heights.

You don’t need pbmtopgm just to use a PGM program on a PBM image. Any PGM program (assuming it uses the Netpbm libraries to read the PGM input) takes PBM input as if it were PGM, with only the mininum and maximum gray levels. So unless your convolution rectangle is bigger than one pixel, you’re not gaining anything with a pbmtopgm step.

see also

netpbm, pgmtopbm , pbm


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