Fourth, CIELAB uniform color space
In view of the non-uniformity of the CIEXYZ color space, the International Commission on Illumination has recommended several internationally common uniform color space and color difference formulae to countries around the world. The CIELAB color space is one of them. The CIELAB space is a nonlinear transformation space in the CIEXYZ space. The formula is as follows:
The advantage of CIELAB's uniform color space is that it can better reflect the psychology of the object color when the color difference of the color is greater than the visual recognition threshold (just noticeable) but smaller than the color difference value of the adjacent two poles in the Munsell system. Feel the effect. Moreover, CIELAB is intuitive and intuitive to evaluate colors. And because CIELAB is a device-independent color space, in color management, using this feature, it is possible to communicate and calculate the correspondence between the original color, the screen color, and the printing color in the color space so that the colors are visually consistent and different. Color conversion between devices.
Fifth, CMYK color space
The printing industry expresses colorful colors and tones through the overprinting of different dot area ratios of the three primary colors of blue (C), (M), and yellow (Y) inks. This is the CMY color space of the three primary colors. In actual printing, four colors (C), (M), Y (yellow) and BK (BK) are generally used. In the middle of the printing, the tone is increased to a darker tone.
The CMYK color space is related to the equipment or the printing process, and the process method, the characteristics of the ink, the characteristics of the paper, etc., have different printing results under different conditions. So the CMYK color space is called the device-dependent table color space. Moreover, CMYK has a multi-valued nature, that is, for the same color with the same absolute chromaticity, under the same printing process premise, the CMYK digital combination can be used to express and print. This feature has brought a lot of trouble to the color management, also brings a lot of flexibility to the control.
In the printing process, it is necessary to go through a color separation process. The so-called color separation is to convert the RGB color used in the computer to the CMYK color used in printing. There are two complicated problems in the conversion process. One is that the two color spaces are not exactly the same in the range of the expression color. The RGB color gamut is larger and the CMYK is smaller, so the gamut compression is needed; The second is that these two colors are related to the specific equipment, and the color itself is not absolute. Therefore, it is necessary to perform the conversion through a device-independent color space, that is, the XYZ or LAB color space described above can be used for conversion.
The above several color spaces are the most common color conversion spaces in color management, so understanding them and the relationship between them is very important.
Table lamps generally refer to electric lamps with bases that are placed on the table. However, with the advancement of technology, the appearance and shape of table lamps are constantly developing, and magnetic table lamps that can be attached to any position have gradually appeared. , its small and exquisite, easy to carry. The function of the table lamp is mainly to illuminate, which is convenient for reading, learning, work, etc. The table lamp has far surpassed its own value and has even become a work of art. What role does lighting play in home life? In the dark night, the light is the wizard, and it is the master of creating a warm atmosphere. Through the layers of light and shadow, the space is full of vitality; during the day, the lamps become the decorative art of the living room, which embellishes the life together with the furniture, fabrics and decorations.
Table lamps are classified according to their functions: reading table lamps, decorative table lamps, accompanying reading table lamps, and portable table lamps.
Reading table lamp, the lamp body is simple and light in appearance, refers to a table lamp specially used for reading and writing, this kind of table lamp can generally adjust the height of the lamp pole, the direction and brightness of the light, mainly for the lighting reading function.
The decorative table lamp has a luxurious appearance, various materials and styles, and a complex lamp body structure. It is used to embellish the space effect. The decorative function is as important as the lighting function.
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