pamrgbatopng, pamtopng, pngtopam: add pages (#12399)

pages/common/pamtopng.md

@@ -0,0 +1,21 @@
+# pamtopng
+
+> Convert a PAM image to PNG.
+> See also: `pnmtopng`, `pngtopam`.
+> More information: <https://netpbm.sourceforge.net/doc/pamtopng.html>.
+
+- Convert the specified PAM image to PNG:
+
+`pamtopng {{path/to/image.pam}} > {{path/to/output.png}}`
+
+- Mark the specified color as transparent in the output image:
+
+`pamtopng -transparent {{color}} {{path/to/image.pam}} > {{path/to/output.png}}`
+
+- Include the text in the specified file as tEXt chunks in the output:
+
+`pamtopng -text {{path/to/file.txt}} {{path/to/image.pam}} > {{path/to/output.png}}`
+
+- Cause the output file to be interlaced in Adam7 format:
+
+`pamtopng -interlace {{path/to/image.pam}} > {{path/to/output.png}}`