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Diffstat (limited to 'pnmcurve.1')
| -rw-r--r-- | pnmcurve.1 | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/pnmcurve.1 b/pnmcurve.1 new file mode 100644 index 0000000..89cb8c4 --- /dev/null +++ b/pnmcurve.1 @@ -0,0 +1,46 @@ +.Dd January 19 2008 +.Dt PNMCURVE 1 +.Os +.Sh NAME +.Nm pnmcurve +.Nd apply tone curves to pnm images +.Sh SYNOPSIS +.Nm +.Op Fl r +.Op Fl g +.Op Fl b +.Op Fl c Ar curve +.Sh DESCRIPTION +.Nm +applies tone curves to pnm images. +Curves are specified as a set of control points of a cubic spline. +.Nm +applies the resulting spline curve to the pnm image read +from stdin and writes the resulting image to stdout. +Command line switches allow to apply the curve only to +selected color channels. +.Pp +The options are as follows: +.Bl -tag -width indent +.It Fl r +Apply curve to red channel. +.It Fl g +Apply curve to green channel. +.It Fl b +Apply curve to blue channel. +.It Fl c +Curve to apply. +Curves must be of the form +x1:y1,x2:y2,x3:y3 where xi:yi are +control points of a cubic spline curve. +xi, yi must be in the range [0.0,1.0]. +.El +.Sh EXIT STATUS +.Ex -std +.Sh EXAMPLES +.Dl "pnmcurve -c 0.0:0.0,0.5:0.2,1.0:1.0 < test.pnm > darker.pnm" +.Pp +.Sh SEE ALSO +pnm(5) +.Sh AUTHOR +Johannes Hofmann <Johannes.Hofmann@gmx.de> |