Update cheatsheets

pamcomp

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pamcomp
+
+> Overlay two PAM images.
+> More information: <https://netpbm.sourceforge.net/doc/pamcomp.html>.
+
+- Overlay two images such with the overlay blocking parts of the underlay:
+
+`pamcomp {{path/to/overlay.pam}} {{path/to/underlay.pam}} > {{path/to/output.pam}}`
+
+- Set the horizontal alignment of the overlay:
+
+`pamcomp -align {{left|center|right|beyondleft|beyondright}} -xoff {{x_offset}} {{path/to/overlay.pam}} {{path/to/underlay.pam}} > {{path/to/output.pam}}`
+
+- Set the vertical alignment of the overlay:
+
+`pamcomp -valign {{top|middle|bottom|above|below}} -yoff {{y_offset}} {{path/to/overlay.pam}} {{path/to/underlay.pam}} > {{path/to/output.pam}}`
+
+- Set the opacity of the overlay:
+
+`pamcomp -opacity {{0.7}} {{path/to/overlay.pam}} {{path/to/underlay.pam}} > {{path/to/output.pam}}`