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
0001-Added-cubehelix-monotonically-increasing-colorscheme.patch
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