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vis: visualise input data with colour ramps

this converts the luminance of the linear input signal to an srgb viridis colour map, like in the following example:

note that the output will be sRGB, so if you need rec2020, insert an instance of colour after this and set it to image mode.

connectors

• input rec2020 values, the luminance will be visualised
• output the sRGB viridis coloured version of the input

parameters

• exposure the exposure correction value in stops