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ppmshadow — Add simulated shadows to a PPM image. More information: <https://netpbm.sourceforge.net/doc/ppmshado

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandcliimageaddshadowsppmppmshadowsimulated

Problem

How to use the ppmshadow command: Add simulated shadows to a PPM image. More information: <https://netpbm.sourceforge.net/doc/ppmshadow.html>.

Solution

ppmshadow — Add simulated shadows to a PPM image. More information: <https://netpbm.sourceforge.net/doc/ppmshadow.html>.

Add simulated shadows to a PPM image:

ppmshadow {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

[b]lur the image by the specified number of pixels:

ppmshadow -b {{n}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

Specify the displacement of the simulated light source to the left and the top of the image:

ppmshadow -x {{left_offset}} -y {{top_offset}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

Code Snippets

Add simulated shadows to a PPM image

ppmshadow {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

[b]lur the image by the specified number of pixels

ppmshadow -b {{n}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

Specify the displacement of the simulated light source to the left and the top of the image

ppmshadow -x {{left_offset}} -y {{top_offset}} {{path/to/input_file.ppm}} > {{path/to/output_file.ppm}}

Context

tldr-pages: common/ppmshadow

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