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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}}