Blu-ray Disc
Blu-ray Disc (BD) is an optical storage media format with the
high capacity and performance designed for high definition (HD) video and audio.
The disc size and shape is as same as the standard CD or DVD, but has a room
for much larger amount of data and is capable of higher quality image and audio
than any other media format.
Technology
Blu-ray discs have smaller pits to encode the data that are
packed closer together than CDs or DVDs. The higher number of pits translates
to a larger capacity for the disc. These smaller areas of data can then be read
by a shorter wavelength blue laser, which is where the name "Blu-ray"
comes from.
Capacity
A single-layer BD is capable to hold over 5 times the capacity
of a standard DVD, up to 25 GB of data. For video users, this translates to
11 hours of Standard-definition (SD) video, or approximately 4 hours of HD video
on a disc. Dual-layer BD discs can hold up to 50 GB.
Advantages
Blu-ray is a format created for high capacity data and high
definition video. Here are features that Blu-ray discs are capable of that DVDs
are not:
- Increased disc capacity allowing for HD video up to 1080p
resolution
- New menu integration with increased interactivity and menu
navigation over top of playing video
- Higher capacity for storing and transferring amounts of
data larger than 5GB
- Picture-in-picture functionality
- Improved disc coating with increased resistance to scratches
and smudges
- Enhanced Network/internet connectivity
- 7.1 channels of uncompressed audio
- Faster playback and burning speeds
Image Quality
Superior resolution is a big part of what makes Blu-ray look
great. This means you'll see a more detailed image: more clearly defined wrinkles
in clothing, strands of hair, etc. The technical difference is that Blu-ray's
maximum resolution is 1,920x1,080, while DVD is limited to 720x480. Beyond resolution,
Blu-ray also uses better video-compression methods, resulting in more contrast
and richer colors. It's the highest-quality video format available today, and
in some ways it surpasses the picture quality of your local movie theater, especially
when shown on a good-performing HDTV or projector.If you like the way HD from
your cable or satellite provider looks, Blu-ray looks even better.
Audio Quality
New high-resolution soundtrack formats, such as Dolby TrueHD
and DTS-HD Master Audio, are identical to the studio master, so you'll be hearing
things exactly as the director and audio engineers intended.
Special Features
The most basic alteration is the pop-up menu, which allows
you to control the menu functions while the movie continues playing. Other alterations
include picture-in-picture video commentary and the ability to download new
content right from your Blu-ray player, although your player needs to have the
right Blu-ray profile to access these features.
Speed
A standard or dual-layer BD is read at 4.29MB per second, which
is roughly 3x the speed of a DVD and 29x the speed of a CD. BD discs also burn
at the same speed. Produplicator BD copiers' burning speed is now up to 12X
BD-R/ BD-R DL. Burning speeds are adjustable for user's purpose.
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