palmtopnm, pnmtopalm: add pages

pages/linux/palmtopnm.md

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+# palmtopnm
+
+> Convert Palm bitmap to a PNM image.
+> More information: <https://netpbm.sourceforge.net/doc/palmtopnm.html>.
+
+- Convert Palm bitmap to a PNM image:
+
+`palmtopnm {{path/to/file.palm}} > {{path/to/file.pnm}}`
+
+- Display information about the input file:
+
+`palmtopnm -verbose {{path/to/file.palm}} > {{path/to/file.pnm}}`
+
+- Convert the n'th rendition of the image contained in the input file:
+
+`palmtopnm -rendition {{n}} {{path/to/file.palm}} > {{path/to/file.pnm}}`
+
+- Write a histogram of the colors in the input file to `stdout`:
+
+`palmtopnm -showhist {{path/to/file.palm}} > {{path/to/file.pnm}}`
+
+- Output the transparent color of the input image if set:
+
+`palmtopnm -transparent {{path/to/file.palm}}`

pages/linux/pnmtopalm.md

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+# pnmtopalm
+
+> Convert a PNM image to a Palm bitmap.
+> More information: <https://netpbm.sourceforge.net/doc/pnmtopalm.html>.
+
+- Convert PNM image to a Palm bitmap:
+
+`pnmtopalm {{path/to/file.pnm}} > {{path/to/file.palm}}`
+
+- Specify the color depth of the resulting bitmap:
+
+`pnmtopalm -depth {{1|2|4|8|16}} {{path/to/file.pnm}} > {{path/to/file.palm}}`
+
+- Choose a compression method for the resulting bitmap:
+
+`pnmtopalm -{{scanline_compression|rle_compression|packbits_compression}} {{path/to/file.pnm}} > {{path/to/file.palm}}`
+
+- Build a custom colormap and include it in the resulting bitmap:
+
+`pnmtopalm -colormap {{path/to/file.pnm}} > {{path/to/file.palm}}`
+
+- Specify the bitpap's density:
+
+`pnmtopalm -density {{72|108|144|216|288}} {{path/to/file.pnm}} > {{path/to/file.palm}}`