Tim Hunt wrote:
> Why not find out the truth, rather than just guessing;-)
>
> http://www.libpng.org/pub/png/pngintro.html
>
> PNG is a bitmap image format.
>
> It supports a variety of bits-per-pixel RBG, and also indexed colour
> like GIF. It supports full alpha channel transparency, as well as
> simple on-off transparency or fully opaque. It allows you to include
> colour calibration information, either full information or just gamma
> correction, which means that images can look the same on both Macs and
> PCs. It supports optional interlacing.
>
> It uses lossless compression, based on zlib, which is the same library
> that gzip is built on. It can also do clever stuff (filters) before
> sending the data to zlib to make the files even smaller whist still
> being lossless.
>
> Some people get confused because you can do 'lossy compression' when
> you create PNG's. For instance you might take you 24bpp bitmap and
> convert it to a 256 colour indexed image before saving it, in order to
> create a smaller file.
>
> Tim.
>
hmm, apparently one of the whole points of the format is lossless
compression. Interesting. Thanks for the info....
