Overview

This is a library for creating bi-level monochrome TIFF images.

Compression

The baseline image compression options are available:

• No Compression
• CCITT Group 3 1-Dimensional
• PackBits

Dithering

The following dithering options are available:

Threshold Dithering

• Fixed (50%)

• Dispersed 2x2

• Dispersed 4x4

• Dispersed 8x8

• Clustered 2x2

• Clustered 4x4

• Clustered 6x6

• Clustered 8x8

Error Diffusion Dithering

• Basic

• False Floyd–Steinberg

• Floyd–Steinberg

• Jarvis-Judice-Ninke

• Stucki

• Burkes

• Sierra 3-Row

• Sierra 2-Row

• Sierra Lite

• Atkinson

• Zhigang Fan

• Shiau-Fan 1

• Shiau-Fan 2

Custom Dithering

Custom dithering options can also be applied by providing a user-defined threshold matrix or error diffusion filter definition.

References

TIFF

• Adobe TIFF 6.0 Specification
• AWare Systems TIFF File Format

Compression

• ITU-T Recommendation T.4 - Group 3 Compression
• ITU-T Recommendation T.6 - Group 4 Compression
• ITU-T Recommendation T.82 - JBIG Compression
• Apple Technical Note TN2013 - PackBits Compression
• Wolfgang Kowalk - CCITT Facsmile Compression Standards
• Mike Kohn - Huffman/CCITT Compression In TIFF

Dithering

• Tanner Helland - Image Dithering
• Tanner Helland - Grayscale Conversion
• Libcaca Study - Halftoning
• Libcaca Study - Error Diffusion
• Lee Crocker et al. - Digital Halftoning
• Michalis Zervos - Image Dithering in Matlab

Test Images

• ITU-T Standard Test Images
• USC-SIPI Image Database
• The Lenna Story

Notes

Here are some enhancements that can be made to this project:

• Improve performance of the compression module
• Parameterize the photometric interpretation
• Parameterize the resolution unit
• Parameterize the byte order
• Support multi-strip images
• Support multi-page documents
• Support CCITT Group 3 two dimensional compression
• Support CCITT Group 4 two dimensional compression
• Create NuGet package