# [−][src]Module image::pnm

Decoding of netpbm image formats (pbm, pgm, ppm and pam).

The formats pbm, pgm and ppm are fully supported. The pam decoder recognizes the tuple types `BLACKANDWHITE`, `GRAYSCALE` and `RGB` and explicitely recognizes but rejects their `_ALPHA` variants for now as alpha color types are unsupported.

## Structs

ArbitraryHeader | Header produced by a `pam` file ("Portable Arbitrary Map")
BitmapHeader | Header produced by a `pbm` file ("Portable Bit Map")
GraymapHeader | Header produced by a `pgm` file ("Portable Gray Map")
PNMDecoder | PNM decoder
PNMEncoder | Encodes images to any of the `pnm` image formats.
PNMHeader | Stores the complete header data of a file.
PixmapHeader | Header produced by a `ppm` file ("Portable Pixel Map")

## Enums

ArbitraryTuplType | Standardized tuple type specifiers in the header of a `pam`.
PNMSubtype | Denotes the category of the magic number
SampleEncoding | The kind of encoding used to store sample values

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