PNG - Portable Network Graphic format (pronounced "ping")
Developed as an alternative to GIF and JPEG
- Requires Internet Explorer Version 4.0 or greater, Netscape Navigator 4.0.4
- 8-bit and 24-bit support
- enhanced resolutions of 16-bits (gray scale) and 48 bits (true color) per
pixel, and up to 16 bits of alpha data.
- lossless compression
- create and use up to 8-bit masks, allows for variable transparency
- Gamma control, which gives cross-platform consistency of image brightness.
Macs have a gamma of about 1.8 and PCs a gamma of 2.2. Graphics that look
great on a Macintosh often look dark on a PC.
- interlacing preview support after only 1/64 of image downloaded.
- Better than JPEG for photos with fine detail (such as lines).
- 8-bit version yields slightly smaller file sizes than GIF
- 24-bit version file size are much larger than JPEG files due to the fact
that PNG is lossless
For example, a PNG-24 file of about 350k, will often compress to 25k Jpeg