1. An image evaluating apparatus for acquiring image data produced by electronically reading an evaluation chart on a recording medium and quantifying quality of the evaluation chart based on the image data, comprising: a standard positional information acquirer for acquiring standard positional information about a plurality of regions of interest to be quantified which are designated in a standard image region that is an image region having a standard size in the evaluation chart; an image magnification calculator for calculating an image magnification which represents a size ratio of a measurement image region represented by the image data to the standard image region; and a positional information calculator for calculating positional information of a plurality of regions of interest depending on the measurement image region based on the standard positional information acquired by the standard positional information acquirer and the image magnification calculated by the image magnification calculator.