Christian K. wrote: > Eric Firing schrieb: >> Christian K. wrote: >>> Hi everyone, >>> >>> is it possible to map a certain range within the value-range of a image >>> plot to >>> a constant value? Currently I am overlaying a filled contour plot with just >>> two >>> contour levels on top of an image plot. This works, but I would like to >>> display >>> the plateau in the colorbar as well, so that the color changes continously >>> over >>> the whole value range but in the specified range where it should remain >>> white. >>> I guess I would need a special colormapper to achieve that. >> Yes. See >> http://matplotlib.sourceforge.net/examples/pylab_examples/custom_cmap.html >> for an explanation of how to make one. >> >> Actually, you can achieve what you want with either a special cmap, or >> with a special norm. I don't think we have any examples of the latter. > > Tahsnk, Eric. I know understand how to create a discontinous colormap. > However I cannot think of an elegant way how to map the data value range > to the [0,1] color map range so that always the _value_ range between > e.g. 0.41 and 0.43 will be displayed white regardless of the lower and > upper bounds of the data value range.
It sounds like you really need to make a custom subclass of Normalize; see the source for Normalize in mpl's colors.py to get an idea of what is required. Eric > > Regards, Christian ------------------------------------------------------------------------------ The NEW KODAK i700 Series Scanners deliver under ANY circumstances! Your production scanning environment may not be a perfect world - but thanks to Kodak, there's a perfect scanner to get the job done! With the NEW KODAK i700 Series Scanner you'll get full speed at 300 dpi even with all image processing features enabled. http://p.sf.net/sfu/kodak-com _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
