Abstract:
A method of selecting optimal inks from a plurality of ink candidates for a given colour, said method comprising a) obtaining a measure of spectral reflectance of a print substrate; b) obtaining a measure of the spectral reflectance of a first candidate ink of a first colour; c) predicting a colour gamut for the first candidate ink based on the spectral reflectance of the ink and the spectral reflectance of the substrate; d) repeating steps b) and c) for a second ink candidate of the first colour; e) selecting the ink candidate for which the predicted colour gamut includes the most target spot colours as the optimal ink for the first colour.
Abstract:
[Problem] To provide a technique for calculating the psychophysical value of a color corresponding to an arbitrarily defined tone by modeling a tone concept defined in the PCCS (Practical Color Co-ordinate System). [Solution] A method for, regarding multiple types of tones defined in the PCCS, generating a definitional equation for each saturation to which each of the tones belongs, wherein a computer acquires the Munsell values of colors belonging to respective multiple tones belonging to the same saturation among the multiple types of tones defined in the PCCS, the computer stores the acquired multiple Munsell values in a predetermined storage device, the computer converts each of the multiple Munsell values stored in the storage device into a value in a predetermined color space composed of two axes of values representing lightness and values representing vividness, and the computer performs a predetermined regression calculation on a point group projected to the predetermined color space to find a regression equation passing through the origin of the predetermined color space.
Abstract:
A color calibration device, a color calibration method thereof, a display apparatus and a display system having the same are provided. The color calibration device (101) includes a storage (116) configured to store at least one of characteristic information of a display screen that is measured by a color sensor, and color calibration information acquired by the color sensor; and a controller (117) configured to calibrate a color of the display apparatus by using at least one of the characteristic information and the color calibration information.
Abstract:
The invention discloses a method of managing color data based on color data in an HSaIn format in an HSaIn color space, comprising: acquiring color data in an XYZ format at an input device side; converting the acquired color data in the XYZ format at the input device side into color data in an HSaIn format. The method can further comprise mapping the color data in the HSaIn format at the input device side to obtain color data in an HSaIn format at an output device side; converting the color data in the HSaIn format at the output device side into color data in an XYZ format; converting the color data in the XYZ format at the output device side into one in a format of the color data of the output device. Since a conversion of chromatic color data independent of the device into chromatic color data dependent on the output device is achieved in this method, the output chromatic image is not influenced by color characteristics of the output device; and the analytical matrix operation adopted in the managing process is easily achieved, so the calculating process for the conversion is simple, the conversion accuracy and efficiency are improved, and the conversion speed is accelerated.
Abstract:
The invention relates to methods of digital colour image processing, in particular - to selection of images corresponding to more than three different spectral bands from a single RGB data set. In the proposed method of multi-spectral imaging, the object is illuminated simultaneously at several spectral bands, and the values of R i -, G i - un B i -signals detected at each i-pixel of the image are identified. Further they are compared mutually and with externally determined signal discrimination level S that allows registering only one or two of the R-, G- and/or B-bands within the spectral sensitivity range of the sensor. In order to increase the number of available spectral images, the S-values are continuously variable up to the highest of all possible signal values of the R, G or B band, with condition that linear photo-response of the RGB sensor is ensured. Depending on the S-value, two situations are analyzed - if two colour band signals are registered simultaneously (i.e. B and G, G and R or B and R), or if the signals are registered only at one colour band - and after logical analysis the spectral interval of the pixel-registered radiation is identified. Further each spectral image is formed from the pixels or pixel groups that correspond to a particular selected spectral range. A device for multi-spectral imaging to implement this method comprises a multi-spectral light source, objective-equipped digital RGB sensor, RGB data set storage device, convertor for converting the RGB data into a set of spectral intensities in accordance with the selected signal discrimination level, selector of images for selecting the images related to each particular spectral band, and the output device, e.g. PC-monitor.
Abstract:
Spectral characteristics of an object is estimated using an extended sensor response, which includes a product of at least two light intensity signals whose wavelength ranges are partially overlapped with each other.
Abstract:
A method for analyzing the color deviations of images using an image sensor. The received image sensor signal is analyzed pixel by pixel. The inventive method is characterized by the following steps: an image sensor signal is produced for each color channel from a plurality of color channels; the image sensor signal from a first color channel is combined with the image sensor signal of a second color channel according to a first calculation instruction, whereby an output signal of a first color contrast channel is generated, and the image sensor signal of a third color channel is combined with the image sensor signals of the first and second color channel according to a second calculation instruction, whereby an output signal of a second color contrast channel is generated; the output signals of the color contrast channels are classified.
Abstract:
Ein Notebook Rechner ist mit einem in seine Tastaturplatte (1) integrierten Lichtmesssensor (10) ausgestattet, welcher den Monitor (4) des Rechners im geschlossenen Zustand ausmessen kann. Der Lichtmesssensor wird (nach einer vorgängigen herstellerseitigen Linearisierung) im in den Notebook Rechner eingebauten Zustand auf den zuvor mittels eines externen Farbmessgeräts vollständig charakterisierten bzw. profilierten Monitor des Notebook Rechners kalibriert, die dabei erzeugten Kalibrierungsdaten werden nicht-flüchtig, vorzugsweise im Lichtmesssensor selbst angespeichert. Anhand der abgespeicherten Kalibrierungsdaten des Lichtmesssensors lassen sich die Sensor-Signale in X,Y,Z-Farbwerte umrechnen. Der an sich nur Leuchtdichten bzw. Helligkeiten messende Lichtmesssensor wird auf diese Weise zu einem Colorimeter, das in Kombination mit dem Monitor, auf den es kalibriert wurde, zuverlässige Ergebnisse liefert. Mit Hilfe des so kalibrierten Lichtmesssensors lässt sich jederzeit eine Neu-Kalibrierung (Profilierung) des Monitors durchführen.