Re: Support of RGBA 10x10x10x2 ?
Glenn Randers-Pehrson <[email protected]>
| Newsgroups | gmane.comp.graphics.png.general |
|---|---|
| Message-ID | <CA+PdXcvhVBQ5Q3yhB3aQ34UMZk3qYD77wV6yOJVNS2K8A4EFAA@mail.gmail.com> |
On Sat, Jan 14, 2017 at 10:13 AM, John Bowler < [email protected]> wrote: > On Sat, Jan 14, 2017 at 6:48 AM, Glenn Randers-Pehrson > <[email protected]> wrote: > > On Fri, Jan 13, 2017 at 2:52 PM, Alexey Solovey <[email protected]> > wrote: > >> > >> Hello. Will support PNG format as RGBA/RGB 10x10x10x2 bits? > > > > Yes, of course. You write a 16-bit RGBA 16x16x16x16 together with > > the sBIT chunk that conveys the channel depths (sBIT 8 8 8 2). > > sBIT 10 10 10 2 > d'oh, thanks. That's what I had in mind, but dementia is setting in... > > > It takes 64 bits per pixel instead of 32, but I expect that the zlib > compression > > makes up for that difference (I haven't tested that). > > It's not going to be very good, but it is probably comparable to the > result of bit-packing the values into 32 bits then LZ77 compressing > 4-byte pixels. In neither case are the bit patterns aligned to byte > boundaries so they don't compress well with LZ77. > It also defeats the filtering that is based upon correlation of bytes between adjacent pixels. Glenn ------------------------------------------------------------------------------ Developer Access Program for Intel Xeon Phi Processors Access to Intel Xeon Phi processor-based developer platforms. With one year of Intel Parallel Studio XE. Training and support from Colfax. Order your platform today. http://sdm.link/xeonphi _______________________________________________ png-mng-misc mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/png-mng-misc