alpha blending


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alpha blending

In computer graphics, the combining of the alpha channel with other layers in an image in order to show translucency. The alpha channel is an additional eight bits used with each pixel in a 32-bit graphics system that can represent 256 levels of translucency. Black and white represent opaque and fully transparent, while various gray levels represent levels of translucency.

More than one layer in a multilayered image may contain a translucent component, thus multiple levels of blending may be required. If the graphics accelerator performs the blending in its own hardware, the results are displayed considerably faster. See alpha channel and translucency.


Using the Alpha Channel
The image on the right shows how translucency can be applied to an object using the alpha channel. (Image courtesy of Intergraph Computer Systems.)
References in periodicals archive ?
For each output display channel, eight layers support alpha blending where a transparency value is applied evenly to the entire layer.
CyberLink PowerProducer 3 features alpha blending DVD templates, a technique to overlay two videos with the top video being completely or partially translucent so that the second layer is visible.
The radar picture may be scaled to fill the graphics window, with the alpha blending providing the mixing of map graphics and radar with the window.
The Cyberpro 5005 chip offers a 64-bit 2D graphics engine, outstanding alpha blending capabilities and two video-capture ports which enable the merging of TV, VCR, DVD and video camera signals.
ATI's RAGE 128-based chips have the power to handle with ease advanced visual effects such as alpha blending, fog, video textures, texture lighting, reflections, shadows, LOD biasing, texture morphing, and vivid color rendering - all needed to run today's graphics-intensive business, consumer and entertainment applications and development tools.
ATI's RAGE 128-based chips have the power to handle with ease advanced visual effects such as alpha blending, fog, video textures, texture lighting, reflections, shadows, LOD biasing, texture morphing, and vivid color rendering -- all needed to run today's graphics-intensive business, consumer and entertainment applications and development tools.
But they also wanted greater levels of video integration, video/graphics alpha blending, and a design based around low-cost RISC processors.
The CyberPro50XX family of chips incorporate seven major multimedia functions that are the most integrated in a single chip compared to recently announced chips from Broadcom, or ATI including FlexiBus(TM) (glue-less interface to CPUs), NTSC/PAL TV Encoder, Video Processor, AC97 Audio Processor, Hardware Alpha Blending, Graphics Accelerator, SoftModem support along with hardware features unique to IGST including VideoDirect(TM) direct video pass through, two video input ports, Picture-in-Picture (PIP) and Macrovision(TM).
All of this brings you the features used in many of the latest games such as multi-pass rendering, bump mapping and alpha blending.
Additionally, the chip offers an 8-bit full-screen on-screen-display capability with alpha blending and flicker filtering, composite and S-video TV outputs, interlaced or progressive analog component video outputs (YPbPr or RGB) scalable up to HDTV resolution and 5.