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24 Glossary - Synchronization
Back Buffer
A type of offscreen memory used to provide smooth video and 2D graphics
acceleration. This technique uses two frame buffers, so the process is often referred
to as “double-buffering.” While the contents of one buffer are displayed, a second
buffer, called the “back” buffer, holds the frame being worked on. In this way, users
will only see complete, smooth frames displayed onscreen.
Bilinear Filtering
This filtering method reduces the blockiness caused when zooming into a 3D
surface that is at a right angle to the viewer. A newspaper photo examined closely
enough will show that the picture is made up of tiny dots. If the photo was enlarged
it would start to look “blocky” and less distinct. This is also a problem for computer-
generated images, especially for surface details.
Bit Depth
Refers to the number of data bits required to store color information about a pixel.
Larger bit depth means a greater range of color information is capable of being
encoded into each pixel. For example, 1 binary bit of memory can only encode to
either “0” or “1.” So a graphical bit depth of 1 means that the display can only show
two colors, the black and white of a monochrome display. Four-bit color depth is
capable of displaying 16 colors because there are only 16 different combinations of
4 bits (0000, 0001, 0010... to 1111). Sixteen-bit color is capable of reproducing 65,536
colors, 24-bit color can display up to 16,777,216 individual colors, and 30-bit color can
display up to one billion individual colors.
Bitmap
A bitmap is a graphic or character representation composed of individual pixels,
arranged horizontally in rows. A monochrome bitmap uses one bit per pixel (bpp).
Color bitmaps may use up to 32bpp, depending on the color depth selected.
Brightness
The amount of white or black that is applied to all colors onscreen. By making the
screen “brighter” you are adding more white to it. This should not be confused with
luminosity, which measures the actual light level emitted from the computer
display.
Buffer
A name referring to portions of on-board video memory. One large buffer is always
used to display images to the screen; this is the “display buffer.” The rest of offscreen
memory is typically used by applications as back buffers, z-buffers, and texture
buffers.
Color Component
Three color components (Red, Green, and Blue) combine in various intensities to
determine the color of each pixel on the screen. The values of each color component
are graphically represented by a corresponding color curve.
Color Correction
Correct discrepancies between the real color value and the way a screen displays
it. Color discrepancies can be caused by a variety of sources, including the lighting
conditions in the work area and gradual shifts in color over time on monitors or
flat panel displays.
ATI FirePro™ S400 Syncronization Module
© 2009 Advanced Micro Devices, Inc.