pnm decoding and encoding
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# PNM
-provides encoders and decoders for the portable anymap formats. \ No newline at end of file
+provides encoders and decoders for the portable anymap formats.
+
+> **Warning** 16 bit images are not supported.
+
+### pnm format depth support table
+
+||[PBM](https://docs.rs/pnm/latest/pnm/pbm/index.html)|[PGM](https://docs.rs/pnm/latest/pnm/pgm/index.html)|[PPM](https://docs.rs/pnm/latest/pnm/ppm/index.html)|[PAM](https://docs.rs/pnm/latest/pnm/pam/index.html)
+|----|--|--|--|--|
+|Y |✅|✅|❎|✅|
+|YA |❎|❎|❎|✅|
+|RGB |❎|❎|✅|✅|
+|RGBA|❎|❎|❎|✅|