Vgamma

Vgamma, often written as Vγ, is a symbolic label used in multiple disciplines to denote quantities associated with gamma (γ) or photons. Because γ denotes both radiation and the mathematical gamma function, the meaning of Vgamma varies by field and author, and there is no single universal definition. In physics, Vgamma is frequently encountered as shorthand for quantities linked to photon interactions. For example, in quantum electrodynamics, the electromagnetic vertex that couples a fermion to a photon is represented by a vertex function Γμ; some authors informally refer to the corresponding vector current as Vγ. In model-building contexts, Vγ may denote a photon-mediated interaction term or a light gauge boson associated with a gamma sector, depending on the underlying theory.

In computer graphics and image processing, Vgamma commonly denotes the gamma correction function or the gamma parameter used to adjust luminance. A Vγ transformation maps input intensities to corrected output values to compensate for nonlinear display response, and it is essential for achieving perceptually uniform brightness across images and videos.

Practically, readers should consult the specific source to understand what Vgamma denotes in that context, since the symbol is not standardized across disciplines. See also related topics such as gamma rays, gamma correction, and vertex functions.