Reply to thread

Message

<blockquote data-quote="Spragleknas" data-source="post: 214739" data-attributes="member: 17435">Overscan ExplainedWhat is OverscanOverscan referes to some of the picture being outside the visible area of the TV, essentially cropping the image. Underscan is the opposite, using only part of the available display area.How is Overscan related to 1:1 pixel mapping?In a way it IS possible to have a TV provide 1:1 pixel mapping while still overscanning. A TV with a resolution of say 1280x720, might not actually have 1280x720 visible pixels on screen, potentially yielding a scenario where the pixel mapping is perfect, but not all of the display is visible.Types of OverscanDigital ZoomIn this case the input is digitally scaled/zoomed so that it becomes larger than the actual display area. If your TV does this and it cannot be disabled you will never achieve 1:1 pixel mapping.Optical overscanOptical overscan refers to the TV having less pixels visible than is actually available from the display, or in the case of a rear projection unit, that the image is projected to a larger area than the display surface. In such cases you might get 1:1 with overscan as described above. By giving up on the invisible pixels, this can usually be solved in most recent display drivers, by creating a resolution-within-a-resolution, so that the old resolution is output but only a smaller area is actually available for the operating system(Windows, Linux, Mac OS etc).Source: <a href="http://pixelmapping.wikispaces.com/Overscan+Explained" target="_blank">http://pixelmapping.wikispaces.com/Overscan+Explained</a></blockquote>

[QUOTE="Spragleknas, post: 214739, member: 17435"] [b]Overscan Explained[/b] [u]What is Overscan[/u] Overscan referes to some of the picture being outside the visible area of the TV, essentially cropping the image. Underscan is the opposite, using only part of the available display area. [u]How is Overscan related to 1:1 pixel mapping?[/u] In a way it IS possible to have a TV provide 1:1 pixel mapping while still overscanning. A TV with a resolution of say 1280x720, might not actually have 1280x720 visible pixels on screen, potentially yielding a scenario where the pixel mapping is perfect, but not all of the display is visible. [u]Types of Overscan[/u] Digital Zoom In this case the input is digitally scaled/zoomed so that it becomes larger than the actual display area. If your TV does this and it cannot be disabled you will never achieve 1:1 pixel mapping. Optical overscan Optical overscan refers to the TV having less pixels visible than is actually available from the display, or in the case of a rear projection unit, that the image is projected to a larger area than the display surface. In such cases you might get 1:1 with overscan as described above. By giving up on the invisible pixels, this can usually be solved in most recent display drivers, by creating a resolution-within-a-resolution, so that the old resolution is output but only a smaller area is actually available for the operating system(Windows, Linux, Mac OS etc). Source: [url]http://pixelmapping.wikispaces.com/Overscan+Explained[/url] [/QUOTE]

Verification