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=head1 NAME

pto_var - change image variables inside Hugin .pto project files


B<pto_var> [options] --opt|--link|--unlink|--set "image variables list input.pto


B<pto_var> is a command line tool, suitable for inclusion in shell scripts, and allows the change of image variables inside a Hugin .pto project file.
Optimisation variables can be set, altered, linked and unlinked,  
The following image variables are allowed:

  position: y, p, r, TrX, TrY, TrZ
  lens parameters: v, a, b, c, d, e, g, t
  photometric parameters: EeV, Er, Eb, Vb, Vc, Vd, Vx, Vy, Ra, Rb, Rc, Rd, Re (Vignetting and response parameter will treated as group.)

The image numbers start with zero.
If the number is missing this applies to the variables of all images (In this case a special treatment applies to the position of the anchor image).
An exclamation mark before the variable will remove the variable from the list of variables to optimised.

=head1 OPTIONS


=item B<-o|--output> = file.pto

Output Hugin PTO file. Default: <filename>_var.pto

=item B<-h|--help>

Shows help

=item B<--opt> varlist

 Change optimizer variables

=item B<--modify-opt>

   Modify the existing optimizer variables
   (without pto_var will start with an 
    empty variables set)
   --opt y,p,r           Optimize yaw, pitch and roll of all images
                         (special treatment for anchor image applies)
   --opt v0,b2           Optimize hfov of image 0 and barrel distortion
                         of image 2
   --opt v,!v0           Optimize field of view for all images except
                         for the first image
   --modify-opt --opt !v will not optimize field of view.
   --opt !a,!b,!c        Don't optimise distortion (works only with
                         switch --modify-opt together)

=item B<--link varlist>

   --link v3          Link hfov of image 3
   --link a1,b1,c1    Link distortions parameter for image 1

=item B<--unlink varlist>

   --unlink v5        Unlink hfov for image 5
   --unlink a2,b2,c2  Unlink distortions parameters for image 2

=item B<--set varlist>

   --set y0=0,r0=0,p0=0  Resets position of image 0
   --set Vx4=-10,Vy4=10  Sets vignetting offset for image 4
   --set v=20            Sets the field of view to 20 for all images
   --set y=val+20        Increase yaw by 20 deg for all images
   --set v=val*1.1       Increase fov by 10 % for all images
   --set y=i*20          Set yaw to 0, 20, 40, ...

=item B<--set-from-file filename>

			 Sets variables to new values
			 It reads the varlist from a file


=head1 AUTHORS

Thomas Modes

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