Sun raster

Sun raster is the rasterfile format of SunOS: a 32-byte big-endian header, an optional colormap, then rows of 1, 8, 24 or 32 bits, plain or byte-encoded. It reads and writes through the Egami.Formats.Extended package: register it with WithSunRaster() or WithExtendedFormats() (Extended formats).

Reads	Types 0 (old), 1 (standard), 2 (byte-encoded) and 3 (RGB order); 1, 8, 24 and 32 bits; colormaps of equal red, green and blue planes, and raw colormaps skipped
Writes	Gray rasters as 8-bit gray levels without a colormap, everything else as 24-bit pixels, blue first (type 1), or byte-encoded (type 2) when SunRasterWriterOptions.Rle is set
Natural pixel type	Gray8 for 1-bit and 8-bit images without a colormap or with a gray one, Rgb8 otherwise
FormatInfo	SunRasterFormat.Info: name Sun raster, extensions .ras and .sun, MIME type image/x-sun-raster

Without a colormap, 1-bit pixels are black where set and 8-bit pixels are gray levels. The pad byte of 32-bit pixels is not read as alpha. SunRasterDetails keeps the depth, the colormap, the coding and the byte order.

// SGI codes its rows by default; Sun raster writes them plain unless asked.
using (FileStream sgi = File.Create("duck.rgb"))
{
    image.Save(sgi, SgiFormat.Info, new SgiWriterOptions { Rle = false });
}

using (FileStream sun = File.Create("duck.ras"))
{
    image.Save(sun, SunRasterFormat.Info, new SunRasterWriterOptions { Rle = true });
}

Rows stream from the input as they are asked for. Sun raster has no alpha and no metadata: a save that drops them says so in the Warnings.