Enum TiffCompression 

pub enum TiffCompression {
    None,
    PackBits,
    Lzw,
    Deflate,
    Zstd,
    CcittRle,
    CcittT4OneD {
        eol_byte_aligned: bool,
    },
    CcittT4TwoD {
        eol_byte_aligned: bool,
    },
    CcittT6,
}

Compression scheme for an EncodePage.

Variants

None

PackBits

Lzw

Deflate

Zstd

Compression=50000 — Zstandard (RFC 8478), the de-facto registry extension documented in the OxideAV trace doc docs/image/tiff/tiff-zstd-compression-50000.md. Follows the Compression=8 Deflate template exactly: each strip / tile becomes one self-contained Zstandard frame over the post-predictor sample bytes, so it composes with every byte-aligned pixel format, Predictor = 2, planar writing, tiling, and BigTIFF just like TiffCompression::Deflate. The encoder compression level is an out-of-band runtime parameter (never stored in the file); the writer uses the compression backend’s default.

CcittRle

Compression=2 — CCITT Modified Huffman (TIFF 6.0 §10). Bilevel only. Encoded as a sequence of white/black run-length codes from Tables 1/T.4 and 2/T.4. No EOL codes; rows align to byte boundaries.

CcittT4OneD

Compression=3 — CCITT T.4 1-D (TIFF 6.0 §11). Bilevel only. Each row is preceded by a 12-bit EOL prefix. With eol_byte_aligned, the EOL is byte-aligned (T4Options bit 2).

Fields

eol_byte_aligned: bool

CcittT4TwoD

Compression=3 — CCITT T.4 2-D / Modified READ (TIFF 6.0 §11 with T4Options bit 0 set). Bilevel only. Row 0 is coded 1-D (tag bit 1) and seeds the reference line for row 1; rows 1.. are coded 2-D (tag bit 0) against the previously coded row using the Pass / Horizontal / Vertical mode codes from Table 4/T.4 (docs §1). eol_byte_aligned mirrors T4Options bit 2 just as in TiffCompression::CcittT4OneD.

Fields

eol_byte_aligned: bool

CcittT6

Compression=4 — CCITT T.6 / Modified Modified READ (MMR) (TIFF 6.0 §11). Bilevel only. Every row is 2-D against the previously coded row; the first row’s reference is an imaginary all-white line per T.6 §2.2.1. No EOL framing between rows. The decoder stops at rows rows so no EOFB sentinel is written.

Trait Implementations

impl Clone for TiffCompression

fn clone(&self) -> TiffCompression

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for TiffCompression

impl Debug for TiffCompression

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.