Path: csiph.com!x330-a1.tempe.blueboxinc.net!newsfeed.hal-mli.net!feeder3.hal-mli.net!aioe.org!feeder.news-service.com!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Ingo Thies Newsgroups: comp.graphics.apps.gnuplot Subject: Re: Plotting into table with multiple columns Date: Sat, 08 Oct 2011 13:16:49 +0200 Lines: 53 Message-ID: <9fapp2Fjf8U1@mid.individual.net> References: <9brre9Fvf3U1@mid.individual.net> <9bulcrFl92U1@mid.individual.net> <73c4a8f3-cb45-4e03-b887-58466e760963@v18g2000yqj.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: individual.net 4Jf64sAaDkcEEqEk0C6pbgf8NtA0PZs9kzjnpVWMAbhFEXdpNT Cancel-Lock: sha1:Gwy+vkeI2v9a37nELMSARzPqXek= User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.5; rv:6.0) Gecko/20110812 Thunderbird/6.0 In-Reply-To: <73c4a8f3-cb45-4e03-b887-58466e760963@v18g2000yqj.googlegroups.com> Xref: x330-a1.tempe.blueboxinc.net comp.graphics.apps.gnuplot:638 Hi Ethan, sorry for the late reply. I had been too busy recently for having a frequent look into the group (and thus, unfortunately, did not yet check the patch or the recent addition to CVS, but I will :-)). But thank you so far for implementing this (and thank's to Dave Green for inventing this method)! On 2011-09-22 01:43, EAMerritt@gmail.com wrote: > However, the example you posted earlier used different coefficients > than the > ones used in Green's example. From your experience, do you recommend > making > this or some other change? Would it be worth taking a step back and > making > "cubehelix" a separate palette option with its own set of defining > parameters? I can give more specific answers after having tested the recent addition to the CVS version. In general, I have understood Dave Green's paper and web page so that "cubehelix" refers to the whole method, while he repeatedly used the specific color scheme as an example. In my case, I have used others more frequently (also a modification that uses the L*a*b* space (CIE 1976) rather than RGB directly (formulae are taken from Wikipedia; I haven't made a Gnuplot script yet, only a Fortran program that outputs ready-for-use palette files; "colorhelix" on my gnuplot colortools page). However, both methods have their pro's and con's. > The general case would be easy enough to implement, but it would not > produce > size-optimized PostScript output like the rgbformulae option. On the > other hand, > so far as I know PostScript is the only output mode for which > providing an > rgbformulae yields a size advantage. Another issue I will test asap is the speed of calculating the color scheme. For example, I have dropped using my cubehelix gnuplot script directly in favor of using the RGB output palettes for SPH visualisation, because their the usage of function-defined palettes (in particular, set palette function; i didn't check with rgbformulae yet) makes the rendering process take several times longer. But that might be a consequence of the user-defined function parsing and might be faster with built-in formulae. Greetings, Ingo