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Encyclopedia > Alpha blending
It has been suggested that alpha compositing be merged into this article or section. (Discuss)

Alpha blending is a convex combination of two colors allowing for transparency effects in computer graphics. The value of alpha in the color code ranges from 0.0 to 1.0, where 0.0 represents a fully transparent color, and 1.0 represents a fully opaque color. Image File history File links Please see the file description page for further information. ... In computer graphics, alpha compositing is often useful to render image elements in separate passes, and then combine the resulting multiple 2D images into a single, final image in a process called compositing. ... A convex combination is a linear combination of data points (which can be vectors or scalars) where all coefficients are positive and sum up to 1. ... Color is an important part of the visual arts. ... Transparency is possible in a number of graphics file formats. ... Computer graphics (CG) is the field of visual computing, where one utilizes computers both to generate visual images synthetically and to integrate or alter visual and spatial information sampled from the real world. ...


The value of the resulting color when color Value1 with an alpha value of Alpha is drawn over a background of color Value0 is given by:

Value = Value0(1.0 - Alpha) + Value1(Alpha)

The alpha component may be used to blend to red, green and blue components equally, as in 32-bit RGBA, or, alternatively, there may be three alpha values specified corresponding to each of the primary colors for spectral color filtering. Red is any of a number of similar colors at the lowest frequencies of light discernible by the human eye. ... Green is any of a number of similar colors. ... Blue is any of a number of similar colors. ... 32-bit is a term applied to processors, and computer architectures which manipulate the address and data in 32-bit chunks. ... RGBA color space stands for Red Green Blue Alpha. ... A primary color or colour is a color that cannot be created by mixing other colors in the gamut of a given color space. ... A spectral color is a color that is part of the optical spectrum. ... Coloured and Neutral Density filters An optical filter is a device which selectively transmits light having certain properties (often, a particular range of wavelengths, that is, range of colours of light, or polarizations), while blocking the remainder. ...


Alpha blending is natively supported by these operating systems/GUIs:

Mac OS X is a proprietary operating system developed and sold by Apple Computer which is included with all currently shipping Apple Macintosh computers. ... Windows 2000 (also referred to as Win2K, W2K or Windows NT 5. ... Windows XP is a major revision of the Microsoft Windows operating system created for use on desktop and business computer systems. ... Tux is the Linux mascot. ... A graphical user interface (or GUI, sometimes pronounced gooey) is a method of interacting with a computer through a metaphor of direct manipulation of graphical images and widgets in addition to text. ...

See also


  Results from FactBites:
 
Alpha compositing - Wikipedia, the free encyclopedia (570 words)
are the alpha of the pixels in elements A and B respectively.
Alpha blending is a convex combination of two colors allowing for transparency effects in computer graphics.
The alpha component may be used to blend to red, green and blue components equally, as in 32-bit RGBA, or, alternatively, there may be three alpha values specified corresponding to each of the primary colors for spectral color filtering.
Alpha Blending (1020 words)
Alpha blending is the process of combining a translucent foreground color with a background color, thereby producing a new blended color.
The last two alpha blending functions are fg_blendvb() and fg_blendvbv().
These functions are respectively analogous to fg_blenddcb() and fg_blendvar(), but the resulting blended image is instead written to the active virtual buffer; the current graphics position defines the lower left corner of the blending region.
  More results at FactBites »


 

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