Crate rasterrocket_encode 

Image encoding — write a raster::Bitmap<P> to PPM, PGM, PBM, and PNG.

Supported formats

Function	Format	Accepted pixel types
write_ppm	Netpbm P6 binary	Rgb8, Bgr8, Rgba8 (Xbgr8), Cmyk8, DeviceN8
write_pgm	Netpbm P5 binary	Gray8
write_pbm	Netpbm P4 binary	Gray8 (0 = white, non-zero = black)
write_png	PNG	Rgb8, Gray8, Rgba8

All functions consume the output sink (W: Write). Wrap in std::io::BufWriter at the call site if buffering is needed.

CMYK handling

Neither PPM nor PNG natively supports CMYK. write_ppm converts CMYK/DeviceN to RGB via the naïve subtractive ink-density formula R = 255 − C − K (PDF §10.3.3). For ICC-accurate colour, convert to Rgb8 before encoding.

Re-exports

pub use pbm::write_pbm;

pub use pgm::write_pgm;

pub use png::write_png;

pub use ppm::write_ppm;

Modules

pbm

Netpbm P4 (binary PBM) encoder.

pgm

Netpbm P5 (binary PGM) encoder.

png

PNG encoder (via the png crate).

ppm

Netpbm P6 (binary PPM) encoder.

Enums

EncodeError

Errors that can occur during encoding.