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Fig. 4D. —Sample radiograph of cervical spine. Subtraction images of lateral cervical spine radiographs show what is removed from JPEG image during compression: original image minus maximal-quality JPEG compressed image. Little image detail is lost from original image during maximal-quality compression (C). More detail is lost in maximal-quality JPEG compressed images (D). Considerably more image detail of skull and cervical spine is lost as one progresses from maximal- to minimal-quality compression.