Useful tools and links

This is a collection of useful tools and links to help contributors getting started.

PNG Format

LibPng is considered the reference implementation.

Some useful links for documentation of the PNG format

• PNG spec Overview
• PNG spec
• Extensions to the PNG 1.2 Specification, Version 1.5.0
• Png Tags

Useful testimages for reference:

• Google PNGTestSuite.wiki
• pngsuite

Tiff Format

LibTiff is considered the reference implementation.

• tiffinfo: Allow to check, if a tiff file was encoded correctly.
• tiffcp: Copy, convert, or combine TIFF files.
• tiffcmp: Compare the tags and data in two TIFF files.
• tiffdump: Display directory information from TIFF files.

Some useful links for documentation about the TIFF format

• TIFF 6.0 Specification
• TIFF Supplement 1
• TIFF Supplement 2
• TIFF Jpeg Notes
• TIFF-F/FX Extension (RFC2301)
• TIFF/EP Extension (Wikipedia)
• Adobe TIFF Pages
• Unofficial TIFF FAQ
• CCITT T.4 Compression
• CCITT T.6 Compression

TGA Format

Some useful links for documentation about the TGA format

• Fileformat.info
• Tga Specification

Bitmap Format

Some useful links for documentation about the bitmap format

• Microsoft Windows Bitmap File
• OS/2 Bitmap File Format Summary
• Dr.Dobbs: The BMP File Format, Part 1
• Windows Bitmap File Format Specifications

A set of bitmap test images, which can be used as reference for decoding

• bmpsuite
• eclecticgeek

Image Metadata

• Exif Overview
• EXIF 2.3 Specification
• Adobe XMP Pages
• Adobe XMP Developer Center
• IPTC Introduction
• Metadata structure JPEG