On 9/12/2011 10:35 AM, Benjamin Root wrote: > On Fri, Sep 9, 2011 at 9:51 AM, Pim Schellart <p.schell...@astro.ru.nl > <mailto:p.schell...@astro.ru.nl>> wrote: > > Dear Developers, > > In the field of Astronomy (and in science in general) we often make > images that represent the intensity of some source. > However the color schemes used to display images are not perceived as > increasing monotonically in brightness. > D.A. Green developed a color scheme that does increase monotonically > in brightness and this scheme is already in use in several data > display packages (e.g. CASA and AIPS, two software packages used to > analyze radio astronomy data). > The paper describing this algorithm can be found here > http://arxiv.org/abs/1108.5083 > The main advantage of this color map is that images will look > monotonically increasing in brightness to the eye both on color screen > and when printed in black and white (as is often needed for scientific > papers). > Attached is a patch for _cm.py to add this colormap (named cubehelix > as it is named in CASA) to the list of matplotlib colormaps. > > Complicating this a bit is the fact that the algorithm takes several > parameters as specified in the paper referred to (start color, number > of rotations, hugh parameter and gamma factor). > These parameters are now set to the values they have in the default > CASA color map but ideally they could be changed by the user. > I could not find any other colormap that has this option so I don't > know what the preffered way of doing this is, therefore I left the > values hardcoded which should be ok for most applications anyway. > Please let me know what you think. > > Kind regards, > > Pim Schellart > > > Do we want to add this colormap in the upcoming release, or do we want > to wait for the next release? > > Ben Root >
Please also consider adding the "coolwarm" color map suggested before by Sameer Grover <http://sourceforge.net/mailarchive/message.php?msg_id=27816391>. That message has a patch attached. The colormap is used by Kitware (ParaView) and was designed around these requirements: """ – The map yields images that are aesthetically pleasing. – The map has a maximal perceptual resolution. – Interference with the shading of 3D surfaces is minimal. – The map is not sensitive to vision deficiencies. – The order of the colors should be intuitively the same for all people. – The perceptual interpolation matches the underlying scalars of the map. """ <http://www.cs.unm.edu/~kmorel/documents/ColorMaps/index.html> Thank you, Christoph ------------------------------------------------------------------------------ Doing More with Less: The Next Generation Virtual Desktop What are the key obstacles that have prevented many mid-market businesses from deploying virtual desktops? How do next-generation virtual desktops provide companies an easier-to-deploy, easier-to-manage and more affordable virtual desktop model.http://www.accelacomm.com/jaw/sfnl/114/51426474/ _______________________________________________ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
