Windows-Specific Libraries

ImageLib

Version 4.0, Skyline Tools. This is a 32-bit Windows DLL with Delphi support; version 2.5 also supported 16-bit Windows. It claims ``support for most PNG formats'' and ``image conversion,'' which implies that it has read/write support for PNGs.

http://www.imagelib.com/

ImageMan ActiveX Suite and ImageMan DLL Suite

Version 6.02, Data Techniques. These are suites of ActiveX controls, Visual Basic controls, and DLLs for image manipulation and conversion. They support both 16- and 32-bit Windows and include read/write support for PNGs.

http://www.data-tech.com/imocx/imageman_activex_suite.htm
http://www.data-tech.com/imageman_dll_suite.htm

ImgDLL

Version 4.3, Smaller Animals Software. This is a 32-bit Windows DLL with read/write support for PNGs; it claims to support alpha transparency and gamma correction as well. It can be used with Visual C++, Visual Basic, and so on.

http://www.smalleranimals.com/imgdll.htm

LEADTOOLS

LEAD Technologies. This is a suite of toolkits with image support, including partial read/write support for PNGs. According to the features page, 2-bit PNG images and images with 16 bits per sample are not supported for either reading or writing, and interlacing and alpha transparency are supported only for reading. LEADTOOLS once supported the DOS and OS/2 platforms in addition to 16- and 32-bit Windows, but now only Windows appears to be supported.

http://www.leadtools.com/products.htm

PiXCL Tools

Version 4.22, VYSOR Integration. This is an ``interpreted image-processing and graphics language toolkit'' for creating multimedia presentations, demos, and imaging applications, especially for satellite data. It is available for 32-bit Windows, and it includes both standalone tools and a DLL for user programs.

http://www.vysor.com/p40tools.htm

PixelGraphicLibrary

Version 1.0 beta 5, Peter Beyersdorf. This is an image-manipulation library for either Delphi 2 or 3 under 32-bit Windows, with read/write support for PNGs. It includes a simple demo viewer.

http://www.beyersdorf.com/pgraphe.html

TwistedPixel

Bananas Software. This is an ActiveX control (OCX) for 32-bit Windows. It includes read/write support for PNGs and a number of other image formats, and it can be used with Visual C++, Visual Basic, Delphi, in web browsers, and so on.

http://home.earthlink.net/~bananasoft/twisted.htm

Victor Image Processing Library

Version 5.0, Catenary Systems. This is a DLL for 16-bit and 32-bit Windows; it includes read/write support for PNGs and a number of other image formats, though PNG is only supported in the 16-bit Windows version with a separate add-on (freely downloadable). Apparently, only the 32-bit Windows version is still under active development--the last Windows 3.x release was version 4.25. There is also a version 3.7 for DOS, but it has no PNG support, and the PNG add-on does not apply to it.

http://www.catenary.com/victor/
http://www.catenary.com/victor/download/vicpng.html