Editing PNG (section)

=== TIFF ===
[[Tag Image File Format]] (TIFF) is a format that incorporates an extremely wide range of options. While this makes TIFF useful as a generic format for interchange between professional image editing applications, it makes adding support for it to applications a much bigger task and so it has little support in applications not concerned with image manipulation (such as web browsers). The high level of extensibility also means that most applications provide only a subset of possible features, potentially creating user confusion and compatibility issues.

The most common general-purpose, lossless compression algorithm used with TIFF is [[Lempel–Ziv–Welch]] (LZW). This compression technique, also used in GIF, was covered by patents until 2003. TIFF also supports the compression algorithm PNG uses (i.e. [[Tag Image File Format#TIFF Compression Tag|Compression Tag 0008<sub>16</sub>]] '[[Adobe Systems|Adobe]]-style') with medium usage and support by applications. TIFF also offers special-purpose lossless compression algorithms like [[CCITT Group IV]], which can compress [[binary image|bilevel images]] (e.g., faxes or black-and-white text) better than PNG's compression algorithm.

PNG supports non-premultiplied alpha only<ref name="w3.org" /> whereas TIFF also supports "associated" (premultiplied) alpha.