Day four in Principles of Design and Color Theory class. Today is understanding about Color Spaces.
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| A figure of known Color Settings. |
These are the five of the best known color spaces:
- ProPhoto RGB
- Adobe RGB 1998
- sRGB
- CMYK
- Lab Color Space
ProPhoto RGB
--- The ProPhoto RGB is an output referred RGB color space. It is developed by Kodak. It offers an especially large gamut designed for use with photographic output in mind. This encompasses over 90% of possible surface colors in the CIE L*a*b* color space, and 100% of likely occurring real world surface colors making ProPhoto even larger than the Wide Gamut RGB color space. This primaries were also chosen in order to minimize hue rotations associated with non-linear tone scale operations. One of the downsides to this color space is that approximately 13% of the representable colors are imaginary colors that do not exist and are not visible colors.
Adobe RGB 1998
--- The Adobe RGB color space is an RGB color space developed by Adobe Systems in 1998. It was designed to encompass most of the colors achievable on CMYK color printers, but by using RGB primary colors on a device such as the computer display. This encompasses roughly 50% of the visible colors specified by the Lab Color Space as well as improves upon the gamut of the sRGB Color Space, primarily in cyan-greens.
sRGB
--- The sRGB is a standard RGB color space created cooperatively by HP and Microsoft in 1996 for use on monitors printers and the Internet. It uses the ITU- BT.709 primaries, the same as are used in studio monitors and HDTV, and a transfer function (gamma curve) typical of CRTs. This specification allowed sRGB to be directly displayed on typical CRT monitors of the time, a factor which greatly aided its acceptance. Unlike the other RGB color spaces, the sRGB gamma cannot be expressed as a single numerical value.
CMYK
--- The CMYK is a subtractive color model used in color printing and it is also used to describe the printing process itself. This refers to the four inks in some color printing: Cyan, Magenta, Yellow, and Black. Though it varies by print house, press operator, press manufacturer, and press run, ink s typically applied in the order of the abbreviation. The "K" in CMYK stands for key because in four-color printing, they are carefully keyed or aligned. It may be derived from the last letter of the word "black" because of being the last letter of the word black is "K".
CIELAB color space
--- The CIELAB (CIE L*a*b*) color space is a color-opponent space with dimension L for lightness, and a and b for the color-opponent dimensions. This was defined by the Comission Internationale de l'Eclairage (CIE). In 1931, CIE defined the CIE XYZ color space, which represented all possible colors based on human perception. Like RGB, CIE XYZ has three orthogonal dimensions however XY&Z do not correspond to real colors. They are simply mathematically convenient with Y carrying the luminance information. CIE is usually represented by a 2D "chromaticity diagram" obtained from the CIE XYZ model. The CIE XYZ model and chromaticity diagram are the perceptually uniform. A more uniform version of CIE defined in 1976, officially known as CIE L*a*b*. "L" stands for luminance and again light. "A" stands for the red-green axis. And, "B" stands for the blue-yellow axis. The asterisks were added to differentiate CIE from another L,a,b model.
What I understand most:
- In Lab color space, it is entirely the colors present in the human world, all colors what I see I think.
- The CMYK are for printing.
- The sRGB are standard computers used for monitors and mostly in the internet.
- The Adobe RGB of 1998 are somehow its colors are successful in CMYK.
- The ProPhoto RGB are from photographs.
I understand a lot and it helps me a lot in exploring and learning colors.
