April 05
Prof. Ismael H. F. Santos -  ismael@tecgraf.puc-rio.br                                                          2
O sistema tem muitos Gamas!
http://www.w3.org/TR/2003/REC-PNG-20031110/
the exponent of the display device. For a CRT, this is typically a value close to 2.2.
output_exponent
the exponent of the transfer function applied between the frame buffer and the display device (typically this is applied by a Look Up Table).
LUT_exponent
the exponent of any transfer function performed by the software reading the image datastream.
decoding_exponent
the exponent of any transfer function performed by the process or device writing the datastream.
encoding_exponent
the exponent of the image sensor.
input_exponent