Re: Bit Depth
Ruben Safir <ruben-v1XHP5QhJixWk0Htik3J/[email protected]>
| Newsgroups | gmane.comp.graphics.png.devel |
|---|---|
| Message-ID | <[email protected]> |
On 12/13/2016 08:06 PM, Glenn Randers-Pehrson wrote: > On Tue, Dec 13, 2016 at 7:50 PM, Ruben Safir <ruben-v1XHP5QhJixWk0Htik3J/[email protected]> wrote: > >> >> Indeed, I have 8 bit precision and color type of 6, and I've confirmed >> this visually with od. >> >> How can that be? I don't even know what that prepresents. The image >> has almost 29,000 unique colors. That is not 2^8. >> >> :( >> >> I've research then for nearly 2 days and can't find an explanation for >> this and how it implimented. And I'm very stuck. Does this mean the >> color is 2^8 x 2^8 x 2^8? > > > Yes, 16 million colors x 256 alphas: Color type 6, bit-depth 8 means > RGBA8888. > > See > https://www.w3.org/TR/PNG/#11IHDR > WONDERFUL. It really upsets me that I've done a number of internet searches and never came up with that site. How could w3.org not show up in the searches for this question. All the comes up now is products, stackoverflow and wikipedia! No news groups apear in searches any longer. No mailing list archives? I can't have been the first to ask this. I'm getting old and I see the useful internet, and general education slipping through our fingers, and these kids have no clue that the internet can be used for more than ordering Pizzia! > >> That would be the 24 bit color I've come to >> know and love. >> > > Color type 2, bit-depth 8 is 24-bit RGB888. > > Glenn > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, SlashDot.org! http://sdm.link/slashdot > > > > _______________________________________________ > png-mng-implement mailing list > png-mng-implement-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > https://lists.sourceforge.net/lists/listinfo/png-mng-implement > -- So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and and extermination camps, but incompatible with living as a free human being. -RI Safir 2013 ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot