sfer function.  Note that it is
true CIE Rec. 709 only if you use the default gamma value (i.e. don't
specify any gamma parameters).  This transfer function is a power
function modified with a linear ramp near black.

<P>If you specify neither <B>-cieramp</B> nor <B>-srgbramp</B>, the
transfer function defaults to a simple power function.

<DT><B>-srgbramp </B>

<DD>Use the Internation Electrotechnical Commission (IEC) SRGB gamma
transfer function (as specified in the standard IEC 61966-2-1).  Note
that it 