My "problem" is, that I have "Octave 3.6.2 for Windows Microsoft Visual Studio" on a windows 7 PC, and that version seems to handle 32 bit pixels w.o. problems. So to reuse Octave scriptsÂ.
I'll try Alexander's suggestion Best Eigil Den 05/02/13 00.17 skrev "Daniel Johnson" <daniel.johnso...@gmail.com>: > >On Feb 4, 2013, at 12:48 PM, Alexander Hansen ><alexanderk.han...@gmail.com> wrote: > >> On 2/4/13 10:35 AM, Eigil Krogh Sorensen wrote: >>> Hi >>> >>> I ask the questions below, because it took many hours to install >>> Octave-Atlas on my MAC, so I would like to avoid as much installation >>>time >>> as possible. >>> >>> It seems GraphicsMagic be configured at installation with an "Optional >>> Package/Option": "--with-quantum-depth", but >>> >>> 1) I don't know if the rest of the plot chain in Octave-Atlas can >>>handle >>> more bits per pixel >> >> That's a matter to discuss with the Octave developers on one of the >> octave mailing lists. >> >>> 2) I don't know how to reinstall GraphicsMagick and Octave-Atlas with a >>> new value of "--with-quantum-depth". >> >> >> I believe you would just need to rebuild graphicsmagick, which should go >> quickly. >> >> Can I use the description in >>> http://finkers.wordpress.com/2009/07/24/creating-local-packages/ for >>>that >>> or are there smarter ways to do that? >>> >>> >> >> "--with-quantum-depth" is explicitly set to 16 in the ConfigureParams >> field in graphicsmagick.info, so just try setting that to 32 instead. >> >> I'm not sure why it's set to 16, which is a good reason to keep cc'ing >> the maintainer. > >The default quantum value for GraphicsMagick is 8 which is sufficient for >most uses since most display devices only support 8 bits per pixel >anyway. GraphicsMagick uses floating point math internally to avoid >accuracy issues. The quantum value really only affects quantization noise >in certain operations. I chose a quantum of 16 as a compromise to give >better results for those that need it. The problem is that each higher >quantum value makes GraphicsMagick run slower and doubles the amount of >memory used. Using a quantum of 32 would significantly degrade >performance for very little gain for most users. Upstream recommends 16 >in most cases. If you know that you really need 32, follow Alexander's >suggestion to set --with-quantum-depth to 32. > >Daniel > ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Fink-users mailing list Fink-users@lists.sourceforge.net List archive: http://news.gmane.org/gmane.os.macosx.fink.user Subscription management: https://lists.sourceforge.net/lists/listinfo/fink-users
