Mystery of the Lagorio Chart – Mapping the human tone response

Below is a "Lagorio Chart." The black line represents where the grey tone appears visually equal in luminosity to the color. It is the map of the tone to color response of the human eye.It was published in "The Complete Amateur Photographer" by Dick Boer, 1948. The idea behind its use was to determine how well the panchromatic film that the photographer was using translated color according to how the human eye sees that relationship.

The test method was quite straight forward. The photographer would take a

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