kosrud / pngcs

Read/write (big) PNG files with C#

PNGCS

A small library to read/write huge PNG files in C#

PngCs is a C# library to read/write PNG images.

It provides a simple API for progressive (sequential line-oriented) reading and writing. It's especially suitable for huge images, which one does not want to load fully in memory.

It supports all PNG spec color models and bitdepths: RGB8/RGB16/RGBA8/RGBA16, G8/4/2/1, GA8/4/2/1, PAL8/4/2/1, all filters/compressions settings. It does not support interlaced images. It also has support for Chunks (metadata).

This is a port of the PngJ Java library. The API, documentation and samples from PNGJ also apply to this PngCs library.

The distribution of this library includes documentation in folder docs/; this is also available on Github Pages.

See also the included sample projects, in folder SamplesTests/.

RELEASES

NOTE: Since version 1.1.4 two assemblies are provided for different environments:

1 For .Net 4.5 : dotnet45/Pngcs45.dll This uses an internal Zlib implementation based on the new .Net 4.5 DeflateStream

Advantages:

• Single dll, does not requires SharpZipLib dll
• Better speed

2 .Net 2.0 compatible: dotnet20/Pngcs.dll This requires an extra dll (included) ICSharpCode.SharpZipLib.dll

Advantages:

• Works with old .net versions (2.0 and above)
• Slightly better compression

LICENSING

The ICSharpCode.SharpZipLib.dll assembly, provided with this library, must be referenced together with Pngcs.dll by client projects. Because SharpZipLib is released under the GPL license with an exception that allows to link it with independent modules, PNGCS relies on that exception and is released under the Apache license. See LICENSE.txt.

HISTORY

See changes.txt in this folder.

Hernan J Gonzalez - [email protected] - http://stackoverflow.com/users/277304/leonbloy

Tommy Ettinger - https://github.com/tommyettinger/