[vorbis] Image compression thread

[Gregory Maxwell]

On Mon, Jul 02, 2001 at 04:15:06PM +0300, Jaakko Lintula wrote:
> On Monday 02 July 2001 14:50, Gregory Maxwell wrote:
> > On Mon, Jul 02, 2001 at 02:36:03PM +0200, Jernej Simonèiè wrote:
> > > PNG is lossless, produces smaller files than GIF, and supports
> > > grayscale images from 1 to 16 bit, paletted images from 2 to 256
> > > colors/palette entries, color images up to 48 bits, transparent
> > > color setting with paletted images, alpha channel (up to 16 bits)
> > > with others.
> > Actually, PNG supports bigger paletted images then that.. Of at
> > least 4096 colors, probably more.
> 
> If PNG supports 48 bit color, then that's actually... hm, 
> 2^48 = 281474976710656 colors. 4096 colors would be only 12 bits.

You missed that I said paletted. Is supports paletted and direct modes, the
direct mode can have 16bits per color component per pixel, where in
paletted mode you can have a palett of n colors (where N can be atleast 4096
if not larger), and the palett is a mapping to a table of RGBA values.

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