ARAMETERS</H2>

<P>The only parameters are the specification of the input image file
and the gamma values.  Every gamma transfer function <B>pnmgamma</B>
uses contains an exponent, which is the gamma value, and you can
choose that value.

<P>Furthermore, you can choose different values for each of the three
RGB components.  If you specify only one gamma value, <B>pnmgamma</B>
uses that value for all three RGB components.

<P>If you don't specify any gamma parameters, <B>pnmgamma</B> chooses
a default.  For 