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}}