igamm

correction

out = igamm(im, gamma) is a gamma corrected version of the image im. All pixels are raised to the power gamma. Gamma encoding can be performed with gamma > 1 and decoding with gamma < 1.

out = igamm(im, 'sRGB') is a gamma decoded version of im using the sRGB decoding function (JPEG images sRGB encoded).

Notes

This function was once called igamma(), but that name taken by MATLAB method for double class objects.
Gamma decoding should be applied to any color image prior to colometric operations.
The exception to this is colorspace conversion using COLORSPACE which expects RGB images to be gamma encoded.
Gamma encoding is typically performed in a camera with GAMMA=0.45.
Gamma decoding is typically performed in the display with GAMMA=2.2.
For images with multiple planes the gamma correction is applied to all planes.
For images sequences the gamma correction is applied to all elements.
For images of type double the pixels are assumed to be in the range 0 to 1.
For images of type int the pixels are assumed in the range 0 to the maximum value of their class. Pixels are converted first to double, processed, then converted back to the integer class.

igamm

Notes

See also