Abstract: In an illumination system (10), comprising: a lamp assembly (14) with a plurality of lamps (12A, 12B, 12C) and associated lamp drivers (13A, 13B, 13C); a common controller (15) for generating control signals (?1, ?2, ?3) for the lamp drivers (13A, 13B, 13C); a memory (18) containing a color table with color points; the color points of the color table are located in a two-dimensional plane corresponding to a ceiling of a color space. Perimeter color points (PC) are located on the borderline of said plane, in groups of equidistant color points, as measured in a perceptual uniform second color space. Equidistant spoke color points (SC) are located on constant hue lines (42) in said plane, constant hue line connecting one of said perimeter color points (PC) to a white point (W).

Abstract: A system and method for color navigation through a CIELAB color space with coordinates hue (H), lightness (L), chroma (C), with intervals ?H, ?L, ?C such that the perceptual color difference AE1Nv, defined according to the formula: AZW =^{AL)2+{fc(H)?ACf+[AH)2, is constant for steps in direction C and L and for steps in direction H along boundary of color space. fc(H) is a proportionality factor between 0 and 1 depending on hue. For hue values between red (H1) and green (H2), fc(H) =1. For hue values between green (H2) and blue (H3), the proportionality factor fc(H) is set to a constant value foB such that N?,GB(fGB) differs less than 50% from NH,RG—For hue values between blue (H3) and red (H1), the proportionality factor fc(H) is set to a constant value f?R such that N^BR^BR) differs less than 50% from NH,RG—.

Abstract: Disclosed is an illumination system that includes a lamp assembly, a controller, a user input device, and a memory defining discrete color points and containing a ID hue table, a ID saturation table, a ID brightness table, and a boundary memory defining a boundary of the color space. On the basis of data received from the user input device and on the basis of the information in the memory, the controller generates color control signals for the lamp assembly. The controller compares the user input data with the information in the boundary memory. If the controller finds that said point is located outside the boundary of the color space, the controller calculates a replacement point on the color space boundary as defined in the boundary memory, and generates its control signals on the basis of the replacement point.

Abstract: An illumination system (10) comprises: a lamp assembly (14) for generating color-variable light (17); a controller (15) for generating control signals (?1, ?2, ?3) for the lamp assembly;—source color input means (20), preferably a color sensor, for inputting to the controller information defining a source color; a memory (30) associated with the controller, containing information defining at least one color harmony rule. On the basis of the input source color, and using the harmony rule from the memory, the controller calculates a target color and generates its output control signals accordingly. Thus, the light output from the lamp assembly harmoniously matches the measured color of surroundings or objects.

Abstract: A lighting system (200) includes light sources (220) configured to provide light; and a controller (210) configured to divide the light sources (220) into a focus group (310) including focus light sources for providing main light and a surrounding group (320) including surrounding light sources for providing background light. The focus light sources have individual focus intensity levels related to each other according to a first relationship, and the surrounding light sources have individual surrounding intensity levels related to each other according to a second relationship. The controller (210) may be further configured to change a ratio between the focus and surrounding groups without changing the first and second relationships, such as by interpolation or multiplying by a factor at least one of the individual focus intensity levels and the individual surrounding intensity levels.

Abstract: A user interface (240) includes buttons (410) associated with lighting scenes stored in a memory (230). Selection of one of the buttons (410) selects an associated lighting scene as a focus group including focus light sources, where the remaining light sources are included in a surrounding group. A contrast switch (430, 435) of the user interface (240) may be configured to change a ratio of the focus group to the surrounding group, and a brightness switch (440, 445) may be configured to change the intensity by multiplying by a factor focus intensity levels of the focus light sources and/or surrounding intensity levels of the remaining light sources.

Abstract: In an illumination system (10), comprising: a lamp assembly (14) with a plurality of lamps (12A, 12B, 12C) and associated lamp drivers (13 A, 13B, 13C); a common controller (15) for generating control signals (?1, ?2, ?3) for the lamp drivers (13A, 13B, 13C); a memory (18) containing a color table with color points; the color points of the color table are located in a two-dimensional plane corresponding to a ceiling of a color space. Perimeter color points (PC) are located on the borderline of said plane, in groups of equidistant color points, as measured in a perceptual uniform second color space. Equidistant spoke color points (SC) are located on constant hue lines (42) in said plane, constant hue line connecting one of said perimeter color points (PC) to a white point (W).

Abstract: An illumination system (100) comprises: a lamp assembly (14); a controller (115); a user input device (19); a memory (120) defining discrete color points, containing a ID hue table (121), a ID saturation table (122), a ID brightness table (123), and a boundary memory (124) defining a boundary of the color space. On the basis of data (x1,x2,x3) received from the user input device and on the basis of the information in the memory, the controller generates color control signals (?1, ?2, ?3) for the lamp assembly. The controller compares the user input data with the information in the boundary memory. If the controller finds that said point is located outside the boundary of the color space, the controller calculates a replacement point on the color space boundary as defined in the boundary memory (124), and generates its control signals on the basis of the replacement point.

Abstract: A system and method for color navigation through a CIELAB color space with coordinates hue (H), lightness (L), chroma (C), with intervals ?H, ?L, ?C such that the perceptual color difference AE1Nv, defined according to the formula: AZW=?{AL)2+{fc(H)?ACf+[AH)2, is constant for steps in direction C and L and for steps in direction H along boundary of color space. fc(H) is a proportionality factor between 0 and 1 depending on hue. For hue values between red (H1) and green (H2), fc(H)=1.

Abstract: An illumination system (10; 100) for generating light comprises: at least one a lamp assembly (14; 114) capable of generating light (17; 117) with a variable color; a controller (15; 115) for controlling the lamp assembly; a user input device (19) coupled to the controller. The controller (15; 115) is designed, on the basis of data received from the user input device (19), to generate color control signals for the lamp assembly. The controller (15) is designed, on the basis of data received from the user input device (19), to calculate a path (47) in a color space (31), to calculate the coordinates of a set of color points (E; CP(2), CP(3)) along the calculated path (47), and to generate its color control signals in accordance with the calculated color points. The illumination system may be for generating dynamic light sequences, or for generating a spatial color distribution.

Abstract: One of the process steps in the manufacturing process of shadow masks (13) for color display tubes (1) is blackening. In this process step, the shadow mask (13) is heated for example to a temperature of at least 600° C. in a furnace in a gentle oxidative atmosphere of a mixture of carbon monoxide and carbon dioxide. Under these conditions the shadow mask (13) is covered with a layer of Fe3O4, also referred to as ‘black rust’. After this the shadow mask (13) is cooled down. The invention describes a new blackening process which has a much higher cooling rate than usual. In the present-day process, a cooling rate of 50° C./min (21) is used; this invention discloses a cooling rate of at least 500° C./min (22) or even more. This results in an improvement by at least 20% of the thermal expansion coefficient, leading to a color display tube (1) with a shadow mask (13) having a higher mechanical stability and hence to an increased picture performance.