Abstract: A method of obtaining a range of colors includes the following steps: selecting a test color from a predetermined set of colors, selecting a test palette comprising a plurality of color samples, measuring the real color of each sample when illuminated by a white light source, measuring the apparent color of each sample when illuminated by a test source formed by the white light source filtered by the test color, measuring the chromatic error between the real color and the apparent color of each sample, taking account of chromatic adaptation, measuring the mean chromatic error for all the chromatic errors, comparing the mean chromatic error to a test value, and adding the test color to the range if the mean chromatic error is less than or equal to the test value.

Abstract: A method of obtaining a range of colors includes the following steps:

Abstract: In an ultrasonic diagnosis device composed of ultrasonic optical elements arranged to be disposed in a mass of fluid in a container together with the object to be examined in order to image the object in an image plane, a source of incoherent sound radiation for irradiating the object, a condenser lens, an imaging objective and an acoustic energy detector system, the incoherent sound radiation source is composed of a turbulence chamber containing a plurality of particles arranged to move essentially randomly relative to one another, and at least one ultrasonic transmitter for irradiating the particles in the turbulence chamber with coherent ultrasound; the imaging objective is composed of at least two individual lenses of homogeneous material which are arranged in symmetry to one another and each having lens face which faces the other lens and which has an aspherical shape; and the detector system is composed of a linear array of detectors for converting the resulting ultrasound image of the object into elect