A mathematical equation embedded in an image file, which is used to modify the image at the moment it is printed. Transfer functions are usually used to lighten images to compensate for DOT GAIN.

A transform which can be used to describe the output of a device (say, an electrical transducer) as a function of the input to the device. In digital imaging, often applied to the function used to transform between intensities in a stored image and those in the representation of that image in the memory of a video display device.

Mathematical, graphical, or tabular statement of the influence which a system or element has on a signal or action compared at input and at output terminals.

An input-to-output measurement of performance that includes both amplitude and phase as functions of frequency. The Fourier transform of the transfer function is the impulse (time) response of the system. See: Frequency Response, Phase Response, Fourier Transform, FFT.

In general terms, the functional relationship between two quantities, such as an input voltage and an output light intensity, or an input range of digital values and an output range of digital values. This is a useful concept for describing the pipeline an image takes, say, from light entering a camera lens to RGB data in computer memory to voltages in a CRT to the light emitted from the monitor.

A mathematical expression that shows how two entities or events occurring in different places or at different times are related.

A transfer function is a mathematical expression of the relationship between the input signal and output signal of a system.

The mathematical relationship between the output of a control system and its input for a linear system, it is the Laplace transform of the output divided by the Laplace transform of the input under conditions of zero initial energy.

A transfer function is a mathematical representation of the relation between the input and output of a system (linear, time-invariant systems).