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Take the situation that the sources input to your display processor look best at a higher resolution than the native resolution of the displays connected to the processor’s outputs. With an EDID management system, you can choose a high native resolution EDID, which is suitable for your source devices, from the EDID list and use that as a fixed EDID at the input. In this way, you can display full resolution windows spread across multiple displays.
Another example may be your processor is usually connected to a wall of displays with a fixed resolution, but you would like to test and develop material offline while connected to some smaller multi-sync monitors with a different native resolution. You can capture the EDID of one of your wall displays, and use this as the emulated EDID of the processor’s output. This will allow your tests and final presentation to have the same pixel dimensions as the original wall displays.
To sum up, the default EDID is generally good and works with a broad range of video sources. This is important to ensure that the source is sending the display a signal it can handle. For example, some TVs can handle full 1080p resolutions, while others can only support a maximum resolution of 720p; and most TVs only support 2 channel audio while a surround sound system could handle full 5.1 or 7.1 digital surround sound.