| 摘要 |
An image processing device performs: acquiring image data representing an image, the image data including a plurality of sets of pixel data each having a multiple-level gradation value, each gradation value falling within a predetermined range between and inclusive of a minimum gradation value and a maximum gradation value, a predetermined number of levels of gradation value falling within the predetermined range; setting a partial range of levels of gradation value, a first number of levels of gradation value in the partial range being smaller than the predetermined number; and determining that the image is a photograph image when the image meets a first criterion that a degree of change in distribution of gradation values is smaller than a reference value, the distribution of gradation value indicating a pixel number of sets of pixel data for each level of the gradation value falling within the partial range.
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