{
    "mode": "man",
    "parameter": "ppmrelief",
    "section": "1",
    "url": "https://www.chedong.com/phpMan.php/man/ppmrelief/1/json",
    "generated": "2026-07-05T11:55:28Z",
    "synopsis": "ppmrelief [ppmfile]",
    "sections": {
        "NAME": {
            "content": "ppmrelief - run a Laplacian relief filter on a portable pixmap\n",
            "subsections": []
        },
        "SYNOPSIS": {
            "content": "ppmrelief [ppmfile]\n",
            "subsections": []
        },
        "DESCRIPTION": {
            "content": "Reads  a  portable  pixmap  as  input.  Does a Laplacian relief filter, and writes a portable\npixmap as output.\n\nThe Laplacian relief filter is described in \"Beyond Photography\" by Holzmann, equation  3.19.\nIt's a sort of edge-detection.\n",
            "subsections": []
        },
        "SEE ALSO": {
            "content": "pgmbentley(1), pgmoil(1), ppm(5)\n",
            "subsections": []
        },
        "AUTHOR": {
            "content": "Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)\n\n\n\n11 January 1991                              ppmrelief(1)",
            "subsections": []
        }
    },
    "summary": "ppmrelief - run a Laplacian relief filter on a portable pixmap",
    "flags": [],
    "examples": [],
    "see_also": [
        {
            "name": "pgmbentley",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/pgmbentley/1/json"
        },
        {
            "name": "pgmoil",
            "section": "1",
            "url": "https://www.chedong.com/phpMan.php/man/pgmoil/1/json"
        },
        {
            "name": "ppm",
            "section": "5",
            "url": "https://www.chedong.com/phpMan.php/man/ppm/5/json"
        }
    ],
    "tldr": {
        "source": "official",
        "description": "Produce a relief of a PPM image.",
        "examples": [
            {
                "description": "Produce a relief of the specified PPM image",
                "command": "ppmrelief {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}"
            }
        ]
    }
}