complex_colormap
Plot complex functions in perceptually-uniform color space
This generates a bivariate color map that adjusts both lightness and hue, for plotting complex functions, the magnitude and phase of signals, etc.
Magnitude is mapped to lightness and phase angle is mapped to hue in a perceptually-uniform color space (previously LCh, now CIECAM02's JCh).
There are currently two ways to handle the chroma information:
Constant chroma ('const')
For each lightness J, find the maximum chroma that can be represented in RGB
for any hue, and then use that for every other hue. This produces images with
perceptually accurate magnitude variation, but the colors are muted and more
difficult to perceive.
Maximum chroma ('max')
For each lightness J and hue h, find the maximum chroma that can be
represented in RGB. This produces vivid images, but the chroma variation
produces misleading streaks as it makes sharp angles around the RGB edges.
Example
Use constant-chroma map to visualize poles and zeros of an analog bandpass filter, with accompanying magnitude and phase plots along jω axis, and a log-dB plot of magnitude for comparison:
Distribution
To create a new release
-
bump the
__version__number, -
publish to PyPi and GitHub:
$ make publish
License
complex_colormap is published under the MIT license.