Re: Sample-based thumbnailing built into libpng?
Glenn Randers-Pehrson <[email protected]>
| Newsgroups | gmane.comp.graphics.png.general |
|---|---|
| Message-ID | <CA+PdXctKxyrGa-C5TF84ASnw-9Yuue1HvL7bM4TP5e87KvGJaw@mail.gmail.com> |
On Thu, Jan 19, 2017 at 3:21 PM, Andrew Klaassen <clawsoon-/[email protected]> wrote: > > A search through this mailing list was frustrated by Sourceforge error > messages, but I did find this previous message from 2008 that touches on > the topic: > > https://sourceforge.net/p/png-mng/mailman/message/20296261/ > > I'm not sure from that message whether it's not possible to sample > [noninterlaced] PNG files, or whether the poster thinks that it's not > useful because decompression is too slow to make it worthwhile. > The message says that it's not possible. That fact is still true. A PNG decoder needs all the preceding bytes in order to decode a row, because of how zlib compression and PNG filtering work. 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-misc mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/png-mng-misc