Pngimage, written by Aphex, is a compression library which enables you to make use of the png image format. After adding the units to your project, you can start to manipulate png objects like a bitmaps or jpegs in delphi. You can create, convert to, edit and many more.
Inside the archive is a compiled HTML help file which contains the basics of manipulating a png object.
Only delphi source code is included in the archive.