 then will skip the
conversions.

<p>The conversion takes time.  And the difference between
intensity-proportional values and gamma-adjusted values may be small
enough that you would barely see a difference in the result if you
just pretended that the gamma-adjusted values were in fact
intensity-proportional.  So just to save time, at the expense of some
image quality, you can specify <b>-linear</b> even when you have true
PPM input and expect true PPM output.

<p>For the first 13 years of Netpbm's life, un