ZtoRGBpy

Version 1.0.1 Documentation

ZtoRGBpy.LogScale

class LogScale(vmin=0.01, vmax=1.0, *, lmax=0.9)[source]

Logarithmic Scaling

Provides a transformation representing a logarithmic transformation, mapping interval \([v_{min}, v_{max}]\) into the interval \([1-l_{max}, 1]\).

__call__(value)[source]

Transform value with scaling function

Parameters:value (array_like […]) – Array of values to be transformed, by the scaling function.
Returns:scaled (array [ value.shape ]) – Scaled transformation (\(T(v)\)) of value

Notes

Performs a logarithmic transformation, mapping the interval \([v_{min}, v_{max}]\) into the interval \([1-l_{max}, 1]\) using the transformation:

\[T(v) = (1 - l_{max}) + \frac{v \cdot log_{10} ( |v| - log_{10} ( v_{min} ) \cdot l_{max} } {|v| \cdot ( log_{10} ( v_{max} ) - log_{10} ( v_{min} ) )}\]
ticks()[source]

Returns a list of tick marks suitable for a colorbar

Generates 3 to 6 logarithmic steps such that the steps are all powers of 10 and bound by the interval [vmin, vmax]

Returns:
  • offsets (Sequence [ float ]) – Returns the Sequence \(T(10^{t_{min}}), \dots, T(10^{t_{max}})\)
  • labels (Sequence [ str ]) – Returns the Sequence \(10^{t_{min}}, \dots, 10^{t_{max}}\), as strings using latex math, as supported by matplotlib’s maths rendering.

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