1. A method of processing ultrasound data in a processor-based ultrasound imaging device, the method comprising: obtaining ultrasound data, including image intensity values, at each of a plurality of scan lines and corresponding pixel locations, based at least in part on one or more ultrasound signals from an imaged region of a subject, each pixel location including a pixel depth; calculating, for each scan line, shadow intensity data that is proportional to a weighted sum of the image intensity values at depths greater than the pixel depth associated with the scan line; generating, as an output of a monotonic function with inputs including at least the shadow intensity data, the ultrasound data, and at least one numerical valued bone separation parameter that adjusts a sensitivity of a bone signal output, an indication of bone presence in the imaged region; generating, as an output of a monotonic function with inputs including at least the shadow intensity data and at least one numerical valued tissue separation parameter that is different from the at least one bone separation parameter and that adjusts a sensitivity of a tissue signal output, an indication of tissue presence in the imaged region; and generating a composite ultrasound image of the subject at least in part by combining the indication of bone presence and the indication of tissue presence.