ppmtoterm, ppmtoascii, pbmto4425: add pages; pbmtoascii: edit page (#12426)

pages/common/pbmto4425.md

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+# pbmto4425
+
+> Display a PBM image on an AT&T 4425 terminal.
+> See also: `ppmtoterm`, `pbmtoascii`.
+> More information: <https://netpbm.sourceforge.net/doc/pbmto4425.html>.
+
+- Display a PBM image on an AT&T 4425 terminal using the terminal's mosaic graphics character set:
+
+`pbmto4425 {{path/to/image.pbm}}`

pages/common/pbmtoascii.md

@@ -1,6 +1,7 @@
 # pbmtoascii
 
 > Convert a PBM image to ASCII graphics.
+> See also: `ppmtoascii`, `asciitopgm`, `ppmtoterm`.
 > More information: <https://netpbm.sourceforge.net/doc/pbmtoascii.html>.
 
 - Read a PBM file as input and produce an ASCII output:

pages/common/ppmtoascii.md

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+# ppmtoascii
+
+> Convert a PPM image to an ASCII image using ANSI terminal color codes.
+> See also: `ppmtoterm`, `pbmtoascii`, `pbmto4425`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtoascii.html>.
+
+- Convert a PPM image to an ASCII image, combining an area of 1x2 pixels into a character:
+
+`ppmtoascii {{path/to/input.ppm}} > {{path/to/output.txt}}`
+
+- Convert a PPM image to an ASCII image, combining an area of 2x4 pixels into a character:
+
+`ppmtoascii -2x4 {{path/to/input.ppm}} > {{path/to/output.txt}}`

pages/common/ppmtoterm.md

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+# ppmtoterm
+
+> Convert a PPM image to an ANSI ISO 6429 ASCII image.
+> See also: `ppmtoascii`, `pbmtoascii`, `pbmto4425`.
+> More information: <https://netpbm.sourceforge.net/doc/ppmtoterm.html>.
+
+- Convert a PPM image to an ANSI ISO 6429 ASCII image, mapping each pixel to an individual character:
+
+`ppmtoterm {{path/to/input.ppm}} > {{path/to/output.txt}}`