pamfunc, ppmchange, ppmcie, ppmcolormask, ppmdim, ppmdist, ppmfade, ppmforge: add pages (#11449)

Co-authored-by: Lena <126529524+acuteenvy@users.noreply.github.com>

pages/common/ppmcie.md

@@ -0,0 +1,20 @@
+# ppmcie
+
+> Draw a CIE color chart as a PPM image.
+> More information: <https://netpbm.sourceforge.net/doc/ppmcie.html>.
+
+- Draw a CIE color chart using the REC709 color system as a PPM image:
+
+`ppmcie > {{path/to/output.ppm}}`
+
+- Specify the color system to be used:
+
+`ppmcie -{{cie|ebu|hdtv|ntsc|smpte}} > {{path/to/output.ppm}}`
+
+- Specify the location of the individual illuminants:
+
+`ppmcie -{{red|green|blue}} {{xpos ypos}} > {{path/to/output.ppm}}`
+
+- Do not dim the area outside the Maxwell triangle:
+
+`ppmcie -full > {{path/to/output.ppm}}`