Method and device that simulate video delivered by video instrument

A non-transitory computer-readable recording medium that stored a computer program that simulates how output video from a video instrument that presents video appears under a given viewing environment, wherein the computer program is configured to cause

• a computer to function as:
• an input unit that receives an environmental illuminance in a viewing environment in which the output video is viewed and a set condition with regard to the video instrument, the set condition including at least an optical output;
• and
• a video contrast calculator that calculates and outputs, by using the environmental illuminance and the set condition received by the input unit, a video contrast based on a ratio of the illuminance of the output video and the environmental illuminance at a video formation plane on which the output video is formed.