---
syntax: markdown
tags: [tldr, common]
source: https://github.com/tldr-pages/tldr.git
---
# 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}}`
