Abstract:
Procedimiento y dispositivo de medición y cálculo de parámetros colorimétricos de cualquier objeto iluminado y fuente luminosa. El procedimiento es dinámico y mide la iluminación ambiente, una zona total o parcial del objeto iluminado o fuente luminosa y calcula los parámetros colorimétricos en dicha zona total o parcial para cualquier tipo de iluminación deseada eliminando la contribución de la iluminación ambiente. El dispositivo es un sistema móvil que incluye al menos un sensor de luz con respuesta espectral a diferentes longitudes de onda del espectro electromagnético visible.
Abstract:
This specification describes various embodiments that relate to methods for providing a wideband colorimeter that can include more accurate outputs. In one embodiment, a narrowband instrument, such as a spectrometer or spectrograph, can be used for calibration of a wideband colorimeter, so that more accurate outputs can be provided. In one embodiment, an optical test equipment, which consists of both a wideband colorimeter and a narrowband spectrograph, can be used for providing a more accurately calibrated wideband colorimeter. As an example, a spectra-camera, which is a hybrid system consisting of both a wideband colorimeter and a narrowband spectrograph, can be used for simultaneous testing by both the wideband colorimeter and the narrowband spectrograph. By doing simultaneous testing, accurate calibration of the wideband colorimeter can be achieved. This specification further describes a mathematical model to characterize a wideband three channel colorimeter with a narrowband multiple channel spectrometer.
Abstract:
A method for characterizing a color in terms of tristimulus values, the method includes providing a source of a color; measuring a set of spectral values for color stimulus associated with the color using a spectral measurement device controlled by a digital processing system; calculating a first set of tristimulus values from the set of spectral values; defining a set of human observer color matching functions, the set of human observer color matching functions being functions of the tristimulus values; and determining a second set of tristimulus values from the set of spectral values using set of human observer color matching functions.
Abstract:
The invention relates to a method and a device for screen calibration for the true-to-original reproduction of surface colors, the spectral reflection distribution of which is known, wherein by setting parameters the screen can be influenced using software and an electronic controller in each partial region of the screen. The invention is characterized in that an observer adapts the reproduced color impression of the screen to the color impression of an original in each partial region of the screen, wherein the original is compared to the screen colors immediately thereafter on the screen surface and the screen parameters are varied until the color impressions of the original and of the screen appear identical to the observer on the respectively viewed partial screen, viewed from a predefined observer angle, and the settings performed are stored in a screen profile.
Abstract:
A test apparatus comprising a self illuminated light source and second moveable element having spectrophotometrically neutral gray and colour patches of predetermined hues and saturations. A digital software file provides identical spectrophotometrically neutral grayscale and colour data which, when reproduced on a monitor or projection system, should match the grayscale and test colors provided by the apparatus. When the apparatus is placed in front of the monitor image or projected image, the neutral grays and colour patches reproduced on the monitor image or projected image are compared against the image of the apparatus.