Crate tiff_encoder

Expand description

A crate for encoding TIFF files.

This crate allows to create any hierarchy of IFDs and to add any tags with any values to each. It does so while avoiding that the user needs to worry about the position of each structure in the file and to point to it with the correct offset.

The main structure of this crate, used to actually write the TIFF file, the is TiffFile. This structure writes the file in little endian by default (but that can be changed) and requires an IfdChain. This IfdChain consists of the first Ifd of the file, the one it points to (if any), and so on. Each Ifd has one or more entries, which are represented by a pair of FieldTag and FieldValues.

Examples

Creating a 256x256 bilevel image with every pixel black.

use tiff_encoder::*;
use tiff_encoder::tiff_type::*;
 
// 256*256/8 = 8192
// The image data will have 8192 bytes with 0 in every bit (each representing a
// black pixel).
let image_data = vec![0x00; 8192];
 
TiffFile::new(
    Ifd::new()
        .with_entry(tag::PhotometricInterpretation, SHORT::single(1)) // Black is zero
        .with_entry(tag::Compression, SHORT::single(1)) // No compression

        .with_entry(tag::ImageLength, LONG::single(256))
        .with_entry(tag::ImageWidth, LONG::single(256))

        .with_entry(tag::ResolutionUnit, SHORT::single(1)) // No resolution unit
        .with_entry(tag::XResolution, RATIONAL::single(1, 1))
        .with_entry(tag::YResolution, RATIONAL::single(1, 1))

        .with_entry(tag::RowsPerStrip, LONG::single(256)) // One strip for the whole image
        .with_entry(tag::StripByteCounts, LONG::single(8192)) 
        .with_entry(tag::StripOffsets, ByteBlock::single(image_data))
        .single() // This is the only Ifd in its IfdChain
).write_to("example.tif").unwrap();