April 14th, 2010
We know you’ve got some questions about the technical aspects of selecting a projector. As always, feel free to email us or post your questions here in this blog.
What is 480p or progressive scan?
Progressive scanning refers to the way images are projected. Think of a time when you clicked on a web link, and the images loaded one line at a time, from top to bottom.
Alternatively, interlaced scanning is what occurs when you see a web image load in a low resolution manner, and then the image gradually becomes clearer. Essentially, what’s happening in this case is that alternative lines are being loaded (for example, the first, third, fifth, seventh lines, etc.) then a second pass is made to “fill in” the remaining lines, making the image become much clearer and crisper.
When it comes to projection technology, a fast progressive scan is desirable, so that images are loaded from top to bottom in the most efficient manner possible.
In the term “480p” the “p” stands for progressive scan (non-interlaced) and the number 480 refers to the vertical resolution. In other words, this technology can provide 480 vertically scanned lines. Typically, 480p uses a horizontal resolution of 640 and a 4:3 aspect ratio. Sometimes, another number may appear after the “p” (such as 30 or 60) and this number would indicate the rate of progressive frames per second (how quickly each individual image can load).
Technically speaking, 480p does not qualify as “high definition television” (HDTV); this is considered EDTV (enhanced definition television).
Here at Projector123.com, all of our rental projectors support 480p (and higher) progressive scan technology. From family gatherings to professional events and presentations, Projector123.com is your one-stop shop for quality rental projectors. Click here to find out how easy it is to rent from Projector123.com.
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