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Legacy Documentation
Digital Image Processing
(2000)
This is documentation for an obsolete product.
Current products and services
Function Index
ScaleGamma
ScaleGamma[
img
]
returns a nonlinearly scaled copy of
img
.
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=
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