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RGBA color model. Example of an RGBA image composited over a checkerboard background. alpha is 0% at the top and 100% at the bottom. RGBA stands for red green blue alpha. While it is sometimes described as a color space, it is actually a three-channel RGB color model supplemented with a fourth alpha channel.
Hexadecimal 8-bit RGB representations of the main 125 colors. A color in the RGB color model is described by indicating how much of each of the red, green, and blue is included. The color is expressed as an RGB triplet ( r, g, b ), each component of which can vary from zero to a defined maximum value.
The fixed brightness settings correspond closely to these formulae to determine the RGB values: color1 := color × 100% color2 := color1 × 93.2% color3 := color1 × 80.4% color4 := color1 × 54.8%. Examples: "Yellow 2" (238, 238, 0) is based on "Yellow" (255, 255, 0) with 255 × 0.932 = 237.66.
In computer graphics, color quantization or color image quantization is quantization applied to color spaces; it is a process that reduces the number of distinct colors used in an image, usually with the intention that the new image should be as visually similar as possible to the original image.
The YIQ color space at Y=0.5. Note that the I and Q chroma coordinates are scaled up to 1.0. See the formulae below in the article to get the right bounds. An image along with its Y, I, and Q components. YIQ is the color space used by the analog NTSC color TV system.
/* RGB model */ p {color: #F00} /* #rgb */ p {color: #FF0000} /* #rrggbb */ p {color: rgb (255, 0, 0)} /* integer range 0 - 255 */ p {color: rgb (100 %, 0 %, 0 %)} /* float range 0.0% - 100.0% */ /* RGB with alpha channel, added to CSS3 */ p {color: rgba (255, 0, 0, 0.5)} /* 0.5 opacity, semi-transparent */ /* HSL model, added to CSS3 */ p ...
Demosaicing. Demosaicing (or de-mosaicing, demosaicking ), also known as color reconstruction, is a digital image processing algorithm used to reconstruct a full color image from the incomplete color samples output from an image sensor overlaid with a color filter array (CFA) such as a Bayer filter. It is also known as CFA interpolation or ...
Advantages. Indexed color saves a lot of memory, storage space, and transmission time: using truecolor, each pixel needs 24 bits, or 3 bytes. A typical 640×480 VGA resolution truecolor uncompressed image needs 640×480×3 = 921,600 bytes (900 KiB).
RGB color spaces are additive colorimetric color spaces specifying part of its absolute color space definition using the RGB color model. [2] RGB color spaces are commonly found describing the mapping of the RGB color model to human perceivable color, but some RGB color spaces use imaginary (non-real-world) primaries and thus can not be ...
RGB uses additive color mixing, because it describes what kind of light needs to be emitted to produce a given color. RGB stores individual values for red, green and blue. RGBA is RGB with an additional channel, alpha, to indicate transparency. Common color spaces based on the RGB model include sRGB, Adobe RGB, ProPhoto RGB, scRGB, and CIE RGB.