Why does the Video Image Appear Grainy?

There are many reasons but we'll touch on the two most likely...... As video tapes age, the recorded signal slowly gets erased due to stray magnetic fields or perhaps the tape having been repeatedly played in a machine that needed to be de-magnetized. As the signal on tape slowly fades away, the signal to noise ratio plummets - the noise accounting for a greater and greater part of the signal picked up by the scanning video heads. The first to "go" are the high frequency components of the image, resulting in an image lacking in detail with a grainy appearance.

Another likely cause is that when the video was originally recorded, there was not sufficient light present. Early cameras had nowhere the sensitivity and dynamic range of the cameras of today.... They all required LOTS of even light to make an acceptable picture. Wedding videos originated in churches for example, are almost always severely under lit.

From the very start, the video suffers from a poor signal to noise ratio ... more.

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