/ping/ (PNG) An extensible file format
for the lossless
, well-compressed storage of raster images
. PNG provides a patent-free replacement for GIF
and can also replace many common uses of TIFF
images are supported, plus an optional alpha channel
. Sample depths range from 1 to 16 bits.
PNG is designed for on-line viewing applications, such as the World Wide Web
, so it is fully streamable
with a progressive display
option. PNG is robust, providing both full file integrity checking
and simple detection of common transmission errors. Also, PNG can store gamma correction
data for improved colour matching on heterogeneous platforms
. Filename extension
: .png. RFC 2083
. W3C PNG pages (http://w3.org/Graphics/PNG/). PNG home page (http://wco.com/~png/).