In this paper we present two systems capable of high-resolution, high-contrast acoustic imaging. In the first system, the object is illuminated by two intersecting acoustic beams, the transmitted fields forming a standing-wave pattern modulated by the object's transmission properties. In the second, a single acoustic beam is normally incident upon the object which again modifies the transmitted fields. In both systems a thin film emulsion of small (1 micron) latex spheres in liquid nonlinearly detects these transmitted waves in the very near field of the object to form an image. The primary detection mechanism is radiation pressure exerted on the spheres. We demonstrate system resolutions better than 10 microns at moderate power levels of 10-3 watt/cm2 to 10-2 watt/cm2. We are also able to image biological specimens with rather good contrast, one practical application of such an imaging system.