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virtual void IW44Image::parm_dbfrac ( float  frac ) [pure virtual]

Sets the dbfrac# parameter. This function can be called before encoding the first IW44 data chunk. Parameter frac# modifies the decibel estimation algorithm in such a way that the decibel target only pertains to the average error of the fraction frac# of the most misrepresented 32x32 pixel blocks. Setting arguments frac# to #1.0# restores the normal behavior.

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