1. An image capture apparatus comprising: a conversion unit that converts an output from an image sensor with nonlinear input-output characteristics and outputting a converted output; an image processing unit that applies image correction processing which changes tone characteristics or contrast to the output from said conversion unit; and a control unit that controls validity/invalidity of said image processing unit in accordance with the input-output characteristics used by said conversion unit, wherein said control unit invalidates said image processing unit when said conversion unit is set to use input-output characteristics where an output value logarithmically increases with a linear increase in input value.