Say you'd like to record a personal voice greeting for your web visitors, or maybe you'd like to add a song to your home page, Peter Lupton has some information to share on the subject: "Wav is currently the most popular audio file format because it is the format defined and endorsed by Microsoft and used by Windows based computers. Today wav files are supported by most platforms and by Netscape and the Internet Explorer.
Wav files can have a range of sample rates and different sample types. Without going into the technical detail, PCM is the purest
Bill Bither likes the PNG format for graphics. In the start of his article, he lays out some of the nifty features that separate it from GIF and TIFF file formats. But there's more.
"However, perhaps the best thing a PNG has to offer is what's called the alpha channel. An alpha channel is one byte of extra data per pixel (or palette entry for 8-bit images) that represents the transparency level of a pixel. A PNG image with alpha is capable of 256 levels of transparency. What does all this mean? For one thing, you can antialias text and images so
APNG is an extension of the PNG format, adding support for animated images. It is intended to be a replacement for simple animated images that have traditionally used the GIF format, while adding support for 24-bit images and 8-bit transparency. APNG is a simpler alternative to MNG, providing a spec suitable for the most common usage of animated images on the Internet.APNG is backwards-compatible with PNG; any PNG decoder should be able to decode the first frame of an APNG and treat it as a normal single-frame PNG.
PNG Structure
An APNG stream is a
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