tiff-forge

A fork of the tiff-encoder crate which supports both TIFF and BigTIFF files with the desired IFDs and entries.

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, are the TiffFile and BigTiffFile structs. 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 of the file, the one it points to (if any), and so on. Each Ifd or BigIfd have one or more entries, which are represented by a pair of FileTag and FieldValues

TIFF Example

Creating a 256x256 bilevel image with every pixel black.

#[macro_use]
extern crate tiff_forge;
use tiff_forge::prelude::*;
use tiff_forge::ifd::tags;

fn main() {
    // 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(tags::PhotometricInterpretation, SHORT![1]) // Black is zero
            .with_entry(tags::Compression, SHORT![1]) // No compression

            .with_entry(tags::ImageLength, LONG![256])
            .with_entry(tags::ImageWidth, LONG![256])

            .with_entry(tags::ResolutionUnit, SHORT![1]) // No resolution unit
            .with_entry(tags::XResolution, RATIONAL![(1, 1)])
            .with_entry(tags::YResolution, RATIONAL![(1, 1)])

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

BigTIFF Example

Creating a large, bilevel BigTIFF with every pixel black

#[macro_use]
extern crate tiff_forge;
use tiff_forge::prelude::*;
use tiff_forge::ifd::tags;

fn main() {
    // 300000*300000/8 = 11250000000
    // The image data will have 11,250,000,000 bytes (~11.25GB) with 0 in every bit (each representing a
    // black pixel).
    let image_data = vec![0x00; 11250000000];

    BigTiffFile::new(
        BigIfd::new()
            .with_entry(tags::PhotometricInterpretation, SHORT![1]) // Black is zero
            .with_entry(tags::Compression, SHORT![1]) // No compression

            .with_entry(tags::ImageLength, LONG![300000])
            .with_entry(tags::ImageWidth, LONG![300000])

            .with_entry(tags::ResolutionUnit, SHORT![1]) // No resolution unit
            .with_entry(tags::XResolution, RATIONAL![(1, 1)])
            .with_entry(tags::YResolution, RATIONAL![(1, 1)])

            .with_entry(tags::RowsPerStrip, LONG![300000]) // One strip for the whole image
            .with_entry(tags::StripByteCounts, LONG![11250000000])
            .with_entry(tags::StripOffsets, ByteBlock::single(image_data))
            .single() // This is the only Ifd in its IfdChain
    ).write_to("example_big.tif").unwrap();
}