<loc>http://www.projectionlogic.com/index_files/Page655.htm</loc>

SHEDDING THE LIGHT ON PROJECTION

What is Resolution?

 

 A computer image is made up of pixels - the more pixels the sharper the image or the higher the definition. The resolution of an image is expressed in either a dimension like 1024 x 768 or an acronym like XGA, both meaning the same thing - there are 1024 pixels across and 786 pixels from top to bottom. XGA stands for Extended Graphics Array. If you get really close to your computer screen you can actually see the pixels, but be careful some times they bite.

 

Other resolutions are:

 

These resolutions represent a 4:3 aspect ratio-

VGA - 640 X 480                                SVGA - 800 X 600

XGA - 1024 X 768                               QVGA - 1280 X 960         

SXGA+ - 1400 X 1050                       UXGA - 1600 X 1200

QXGA - 2048 X 1536                         QSXGA+ - 2800 X 2100

QUXGA - 3200 X 2400

                                                                             

These resolutions represent a 5:4 or 16:9 aspect ratio-

WXGA - 1280 X 800

WXGA+ - 1440 X 900

SXGA - 1280 X 1024                         

WSXGA+ - 1680 X 1050

WUXGA - 1920 X 1200

QSXGA - 2560 X 2048

 

 

What Resolution is High Definition?

 

With the popularity of HDTV reaching new heights, everyone is trading in their old “square” TVs for wide screen models. Sure they look cool, and almost all of them have the capacity to deliver an HD image.  However, the image being sent must be HD in order to be seen in HD. Nothing chaps my butt more than, seeing a “standard” image stretched to fit a wide screen format. Remember a signal must be sent in HD to be seen in HD.

 

We already know that resolution is the number of pixels used to create an image, so how many pixels does it take to make an image HD?  We must first point out that a true HD image is wider than a standard TV image. This is called the aspect ratio. The aspect ratio of a standard TV is 4:3 while HD is typically 16:9, you can learn more about aspect ratio here. There are 3 standard resolutions for HD; 720p (1280x720) 1080i (1920x1080) and 1080p (1920x1080). The “p” in 720p and 1080p stands for progressive scan. Progressive or non-interlaced scanning is any method for displaying, storing or transmitting moving images in which all the lines of each frame are drawn in sequence, in contrast to the interlacing (the i in 1080i) used in traditional television systems where only the odd lines, then the even lines and so on, of each frame (now called a field) are drawn. While there are technically differences between these resolutions, it is hard to see.  All of them create an awesome image.

Blog