Update cheatsheets

pnmpad

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pnmpad
+
+> Add borders to a PNM image.
+> See also: `pnmmargin`, `pamcut`, `pamcomp`.
+> More information: <https://netpbm.sourceforge.net/doc/pnmpad.html>.
+
+- Add borders of the specified sizes to the image:
+
+`pnmpad -left {{100}} -right {{150}} -top {{123}} -bottom {{456}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
+
+- Pad the image to the specified size:
+
+`pnmpad -width {{1000}} -height {{500}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
+
+- Pad the width of the image to the specified size, controlling the ratio between right and left padding:
+
+`pnmpad -width {{1000}} -halign {{0.7}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`
+
+- Pad the width of the image using the specified color:
+
+`pnmpad -width {{1000}} -color {{red}} {{path/to/image.pnm}} > {{path/to/output.pnm}}`