Update cheatsheets

pstopnm

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pstopnm
+
+> Convert a PostScript file to a PNM image.
+> More information: <https://netpbm.sourceforge.net/doc/pstopnm.html>.
+
+- Convert a PS file to PNM images, storing page N of the input to `path/to/fileN.ppm`:
+
+`pstopnm {{path/to/file.ps}}`
+
+- Explicitly specify the output format:
+
+`pstopnm -{{pbm|pgm|ppm}} {{path/to/file.ps}}`
+
+- Specify the resolution of the output in dots per inch:
+
+`pstopnm -dpi {{n}} {{path/to/file.ps}}`