Encode intensity vector in an HSL image

I wanted to mimic emission and absorption spectra of gas lamps. One solution is to encode the spectrum intensity into a specific color component of a simple "rainbow" image, e.g.:

• the luminance component of the HLS color system for an emission spectrum,
• the value component of the HSV color system for a transmission spectrum.

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The following Gist is an example in python/numpy/matplotlib, using standard module colorsys for color system conversion.