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DATE 2016-12-01 LEARN 2024-04-25 | 2024-03-25 | 2024-02-25 | 2024-01-25 | 2023-12-25 | 2023-11-25 | 2023-10-25 | 2023-09-25 | 2023-08-25 | 2023-07-25 | 2023-06-25 | 2023-05-25 | 2023-04-25 | 2023-03-25 | 2023-02-25 | 2023-01-25 | 2022-12-25 | 2022-11-25 | 2022-10-25 | 2022-09-25 | 2022-08-25 | 2022-07-25 | 2022-06-25 | 2022-05-25 | 2022-04-25 | 2022-03-25 | 2022-02-25 | 2022-01-25 | 2021-12-25 | 2021-11-25 | 2021-10-25 | 2021-09-25 | 2021-08-25 | 2021-07-25 | 2021-06-25 | 2021-05-25 | 2021-04-25 | 2021-03-25 | 2021-02-25 | 2021-01-25 | 2020-12-25 | 2020-11-25 | 2020-10-25 | 2020-09-25 | 2020-08-25 | 2020-07-25 | 2020-06-25 | 2020-05-25 | 2020-04-25 | 2020-03-25 | 2020-02-25 | 2020-01-25 | 2019-12-25 | 2019-11-25 | 2019-10-25 | 2019-09-25 | 2019-08-25 | 2019-07-25 | 2019-06-25 | 2019-05-25 | 2019-04-25 | 2019-03-25 | 2019-02-25 | 2019-01-25 | 2018-12-25 | 2018-11-25 | 2018-10-25 | 2018-09-25 | 2018-08-25 | 2018-07-25 | 2018-06-25 | 2018-05-25 | 2018-04-25 | 2018-03-25 | 2018-02-25 | 2018-01-25 | 2017-12-25 | 2017-11-25 | 2017-10-25 | 2017-09-25 | 2017-08-25 | 2017-07-25 | 2017-06-25 | 2017-05-25 | 2017-04-25 | 2017-03-25 | 2017-02-25 | 2017-01-25 | 2016-12-25 | 2016-11-25 | 2016-10-25 | 2016-09-25 | 2016-08-25 | 2016-07-25 | 2016-06-25 | 2016-05-25 | 2016-04-25 | 2016-03-25 | 2016-02-25 | 2016-01-25 | 2015-12-25 | 2015-11-25 | 2015-10-25 | 2015-09-25 | 2015-08-25 | 2015-07-25 | 2015-06-25 | 2015-05-25 | 2015-04-25 | 2015-03-25 | 2015-02-25 | 2015-01-25 | 2014-12-25 | 2014-11-25 | 2014-10-25 Key: Value: Key: Value: MESSAGE DATE 2016-12-13 FROM Ruben Safir SUBJECT Subject: [Learn] Bit Depth From learn-bounces-at-nylxs.com Tue Dec 13 19:50:22 2016 Return-Path: X-Original-To: archive-at-mrbrklyn.com Delivered-To: archive-at-mrbrklyn.com Received: from www.mrbrklyn.com (www.mrbrklyn.com [96.57.23.82]) by mrbrklyn.com (Postfix) with ESMTP id CD885161313; Tue, 13 Dec 2016 19:50:21 -0500 (EST) X-Original-To: learn-at-nylxs.com Delivered-To: learn-at-nylxs.com Received: by mrbrklyn.com (Postfix, from userid 1000) id A2D25161311; Tue, 13 Dec 2016 19:50:18 -0500 (EST) Date: Tue, 13 Dec 2016 19:50:18 -0500 From: Ruben Safir To: png-mng-implement-at-lists.sourceforge.net Message-ID: <20161214005018.GA10351-at-www.mrbrklyn.com> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Cc: learn-at-nylxs.com Subject: [Learn] Bit Depth X-BeenThere: learn-at-nylxs.com X-Mailman-Version: 2.1.17 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: learn-bounces-at-nylxs.com Sender: "Learn" Hello I am completely confused and befuddled by the IHDR entry for bit depth. I was considering that I would lay out the images memory and fill it in with a number of threads. That required that I know the number of bits per pixel. I see that there are methods to convert 2d image information into 3d information using matrix math, but I'm not really concerned about that. I have an image which in the gimp and every other program I have described the image as sRBG format with an alpha channel. Sample precision can be defined as 1,2,4,8, or 16 Bit Depth (sample precision). The rule is that for PNG the sample depth can be only 8 or 16 with an alpah channel for RBG color. 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? That would be the 24 bit color I've come to know and love. -- 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 _______________________________________________ Learn mailing list Learn-at-nylxs.com http://lists.mrbrklyn.com/mailman/listinfo/learn 2016-12-01 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Learn] Fwd: Patrolling the Dark Net, 2016-12-02 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Tutorial on threaded binary tree part 1: simple 2016-12-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Witner Labs 2016-12-04 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Nice lecture on Quantum Mechanics 2016-12-05 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] information access, copyright wars and DRM 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] png data format 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] png data format 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] png data format 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] png data format 2016-12-06 Christopher League <league-at-contrapunctus.net> Re: [Learn] png data format 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] [Hangout-NYLXS] png data format 2016-12-06 John Bowler <john.cunningham.bowler-at-gmail.com> Re: [Learn] [png-mng-implement] 4 byte length storage 2016-12-06 John Bowler <john.cunningham.bowler-at-gmail.com> Re: [Learn] [png-mng-implement] 4 byte length storage 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] [png-mng-implement] 4 byte length storage 2016-12-06 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Ocaml 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: [luny-talk] Humble Bundle O'Reilly UNIX books 2016-12-06 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] JT's words 2016-12-06 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] png data format 2016-12-07 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: png data format 2016-12-08 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: png data format 2016-12-08 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: png data format 2016-12-08 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: png data format 2016-12-10 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] references to pointers 2016-12-10 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ returning lvalue references and pointers and refs 2016-12-10 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] const puzzle and literal type arguments 2016-12-11 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: png data format 2016-12-12 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Fwd: Re: png data format 2016-12-12 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] gene phylogienics of homonids 2016-12-13 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Bit Depth 2016-12-13 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ Threads Workshop 2016-12-13 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Summer Jobs 2016-12-14 From: "Mancini, Sabin (DFS)" <Sabin.Mancini-at-dfs.ny.gov> Subject: [Learn] For Ruben ( + those in NYC Metro ) : Holiday Social Event 2016-12-14 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: [dinosaur] Ceratopsid (Centrosaurinae: 2016-12-15 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Learn] Happy Holidays 2016-12-15 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] zlib demo with vector::resize 2016-12-15 John Bowler <john.cunningham.bowler-at-gmail.com> Re: [Learn] [png-mng-implement] 4 byte length storage 2016-12-15 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: [dinosaur] Elephant bird nuclear genome fragments 2016-12-15 Christopher League <league-at-contrapunctus.net> Subject: [Learn] zlib demo with vector::resize 2016-12-16 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] zlib demo with vector::resize 2016-12-16 Christopher League <league-at-contrapunctus.net> Re: [Learn] zlib demo with vector::resize 2016-12-16 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] PNG Parallel Programming problem 2016-12-17 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] [Hangout-NYLXS] I'm sure it's a coincidence, part n+1 2016-12-17 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] irc thread on the use of object methods in threads 2016-12-17 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] PNG threaded program 2016-12-18 ruben safir <ruben-at-mrbrklyn.com> Re: [Learn] Threads and Object Methods 2016-12-18 ruben safir <ruben-at-mrbrklyn.com> Re: [Learn] Threads and Object Methods 2016-12-18 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Look C++ is a functional programming language 2016-12-19 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] C++ Threading 2016-12-19 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] C++ Threading 2016-12-19 ISOC-NY announcements <announce-at-lists.isoc-ny.org> Subject: [Learn] [isoc-ny] JOB: Telecommunications Policy Specialist -at- NTIA 2016-12-20 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] F'ing Mouse Pad 2016-12-20 mrbrklyn <mrbrklyn-at-panix.com> Subject: [Learn] Phylogenetic study worth noting 2016-12-21 Samir Iabbassen <Samir.Iabbassen-at-liu.edu> Re: [Learn] Noobdy is home 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] Noobdy is home 2016-12-21 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Noobdy is home 2016-12-21 Samir Iabbassen <Samir.Iabbassen-at-liu.edu> Re: [Learn] thread concurancy 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] thread concurancy 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: lamda's in classes 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: lamda's in classes 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: thread concurancy 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Re: Threads and Object Methods 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) thread concurancy 2016-12-21 Ruben Safir <mrbrklyn-at-panix.com> Subject: [Learn] (fwd) Threads and Object Methods 2016-12-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] I need help 2016-12-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Noobdy is home 2016-12-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] thread concurancy 2016-12-21 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] [Hangout-NYLXS] Marnchester by the Sea 2016-12-22 Ruben Safir <mrbrklyn-at-panix.com> Re: [Learn] [Hangout-NYLXS] And be aware you were an unexcused 2016-12-22 ruben safir <ruben-at-mrbrklyn.com> Subject: [Learn] Fwd: Re: thread concurancy 2016-12-23 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] HOPL (History of Programming Languages) 2016-12-23 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Noobdy is home 2016-12-23 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Learn] Tiny Compiler in many languages at Rosettacode.org 2016-12-25 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Learn] Google and C++ 2016-12-25 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Learn] phylogentics 2016-12-27 Samir Iabbassen <Samir.Iabbassen-at-liu.edu> Re: 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