An image cropping method adapted to a digital image device with a first shooting parameter set to take a digital image of an object with a predetermined image size is provided. The method comprises performing an object detection to obtain a first object image size of the object. Then, according to the first object image size and the predetermined image size, the first shooting parameter set is changed to a second shooting parameter set so that the first image size is changed to a second image size under the second shooting parameter set, wherein the second image size is substantailly equal to the predetermined image size. The digital image device with the second shooting parameter set takes a preliminary image of the object. The preliminary image is cropped into the digital image of the object.
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