Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail From: Ingo Thies Newsgroups: comp.graphics.apps.gnuplot Subject: set palette cubehelix Date: Sat, 08 Oct 2011 13:55:39 +0200 Lines: 16 Message-ID: <9fas1rF6r5U1@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 e1Dv+fPnhddAN6WyE6JWbgthVl+m5IkLAcY+/i2m1MSwKlt+7r Cancel-Lock: sha1:HGo3Re7lvou0CLEjir0d1loKe98= 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:639 Hi Ethan, I have made a first test - looks good, well done! I am only wondering why the gamma correction seems to have the opposite effect: gamma>1 makes dark regions appear brighter while the same happens for gamma<1 in mine/Davids code. So in gnuplot gamma=1.5 corresponds to gamma=0.6666.... in the original cubehelix. According to http://en.wikipedia.org/wiki/Gamma_correction I would say that mine interpretation is correct (see the example photograph of the lady in the water). But the Wikipedia article might be wrong as well. Greetings, Ingo