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=head1 NAME
tca_correct - Calculate transverse chromatic aberration
=head1 SYNOPSIS
B<tca_correct> [options] I<inputfile>
<inputfile> is the base name of 4 image files:
=over
=item <inputfile>
Colour file to compute TCA parameters
=item red_<inputfile>
Red channel of <inputfile>
=item green_<inputfile>
Green channel of <inputfile>
=item blue_<inputfile>
Blue channel of <inputfile>
=back
The channel images must be colour images with 3 identical channels. If any of
-R, -G, or -B is given, this file name is used instead of the derived name.
Output: commandline arguments for fulla
=head1 DESCRIPTION
Generates fulla command-line parameters for correction of transverse chromatic
aberration (TCA) from sample photos. Ideal sample photos would have a lot of
contrast over the entire image area, little saturated colour and no blown
highlights.
=head1 OPTIONS
=over
=item B<-h>
Display help
=item B<-l>
input file is PTO file instead of image
=item B<-m> I<method>
optimization method (0 normal, 1 newfit)
=item B<-o> I<optvars>
string of variables to optimize ("abcvde")
=item B<-r>
Reset values (this will zero a,b,c,d,e params and set v to 10) makes sense only
with -l option
=item B<-s> I<<scale>>
Scale for corner detection
=item B<-n> I<<number>>
number of points per grid cell (default: 10)
=item B<-g> I<<number>>
divide image in <number>x<number> grid cells (default: 10)
=item B<-t> I<num>
Remove all control points with an error higher than num pixels (default: 1.5)
=item B<-v>
Verbose
=item B<--save-into-database>
Saves the tca data into Hugin lens database
=item B<-w> I<filename>
write PTO file
=item B<-R> I<<r>>
Use this file as red channel
=item B<-G> I<<g>>
Use this file as green channel
=item B<-B> I<<b>>
Use this file as blue channel
=back
=head1 AUTHORS
Written by Pablo d'Angelo and others.
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