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In computing, opacity refers to the degree to which something is opaque or blocks light, ranging from fully transparent (\(0\%\) opacity) to fully opaque (\(100\%\) opacity). It is a property used in graphics to control how much an element, like a layer, image, or filter, allows what is behind it to show through. A higher opacity value means the object is more solid, while a lower value makes it more see-through. 

How opacity works Transparency vs. opacity: Opacity is the inverse of transparency. A \(100\%\) opaque object is completely solid, while a \(0\%\) opaque object is completely transparent.

Alpha channel: Many modern image formats, like PNG, use an alpha channel that stores an opacity setting for each pixel. This allows for "partial transparency" or translucency, where an object is semi-transparent.

Layering: In image editing and design, opacity is used to blend layers. By adjusting the opacity of an upper layer, you can see the layers beneath it.