channels_to_rgb

channels_to_rgb#

scarlet2.plot.channels_to_rgb(channels)[source]#

Get the linear mapping of multiple channels to RGB channels.

Channels are assumed to be ordered by wavelength, shortest first.

Each channel i is treated as occupying the unit interval [i, i+1] in spectral-index space [0, N]. That space is divided into three equal contiguous bands allocated to B, G, and R:

Blue:  [0,     N/3]
Green: [N/3,  2N/3]
Red:   [2N/3,   N]

The weight of channel i in each RGB output is the fractional overlap of [i, i+1] with the corresponding band. By construction:

  • Column sums equal 1 — 100% of each input channel’s intensity reaches the display (photon conservation).

  • Row sums all equal N/3 — every RGB output channel receives the same total weight (doubly balanced).

Parameters:

channels (int) – Number of channels (any positive integer).

Returns:

Shape (3, channels) mapping input channels onto RGB.

Return type:

array

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