WOLFRAM

Legacy Documentation

Digital Image Processing (2000)

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ScaleGamma

ScaleGamma is an implementation of the so-called gamma transformation.
The options GammaTransferType and GammaInputType may be used to select one of four predefined mappings. The built-in mappings are implementations of the so-called Rec. 709 and sRGB transfer functions. Rec. 709, formally ITU-R Recommendation 709, is an international standard that specifies the basic parameters of HDTV, while sRGB is a standard color space used on the PC and the web.
The options GammaTrasferType→"sRGB" and GammaInputType→"Linear" yield the following transformation:
Options GammaTrasferType→"sRGB" and GammaInputType→"Nonlinear" yield the following transformation:
Options GammaTrasferType→"Rec709" and GammaInputType→"Linear" yield the following transformation:
Options GammaTrasferType→"Rec709" and GammaInputType→"Nonlinear" yield the following transformation:
The option GammaTransferType may also be a user-supplied function.
See also User's Guide 3.4.
New in Version 2.

Example

This loads the package.
In[1]:=
This reads an RGB color example image and scales the image to the range {0,1}.
In[2]:=
This returns a gamma-corrected image.
In[3]:=
Out[3]//InputForm=Out[3]//InputForm=