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karo_luminance

Arguments:

• _type = [itur1990 | itur1990-2 | gmic | gmic-2]

Description:

Compute luminance of selected RGB images according

  itur1990 | itur1990-2 sqr/sqrt | gmic luminance | sqr/sqrt gmic luminance.
sRGB  to RGB and back only with gmic and gmic-2!

Default values:

type=itur1990

Example of use: