tldr/pages/common/ppmshadow.md

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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}}`