Update cheatsheets

ppmtopj

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ppmtopj
+
+> Convert a PPM file to an HP PaintJet file.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtopj.html>.
+
+- Convert a PPM file to an HP PaintJet file:
+
+`ppmtopj {{path/to/input.ppm}} > {{path/to/output.pj}}`
+
+- Move the image in the x and y direction:
+
+`ppmtopj -xpos {{dx}} -ypos {{dy}} {{path/to/input.ppm}} > {{path/to/output.pj}}`
+
+- Explicitly specify a gamma value:
+
+`ppmtopj -gamma {{gamma}} {{path/to/input.ppm}} > {{path/to/output.pj}}`