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#!perl -w
use strict;
use Imager;
=head1 NAME
=for stopwords Inline
inline_replace_color.pl - replace one color with another in an image, using Inline
=head1 SYNOPSIS
perl inline_replace_color.pl fromcolor tocolor inimage outimage
perl inline_replace_color.pl white 808080 foo.jpg bar.png
=head1 DESCRIPTION
This is a simple demonstration of using Imager with Inline::C to
replace one color in an image with another.
Most of the work is done in the inline_replace_color() function.
=over
=cut
# extract parameters
my $from = shift;
my $to = shift;
my $in = shift;
my $out = shift
or die "Usage: $0 fromcolor tocolor inimage outimage\n";
# convert the colors into objects
my $from_color = Imager::Color->new($from)
or die "Cannot convert fromcolor $from into a color: ", Imager->errstr, "\n";
my $to_color = Imager::Color->new($to)
or die "Cannot convert tocolor $to into a color: ", Imager->errstr, "\n";
# do the work
my $img = Imager->new;
$img->read(file=>$in)
or die "Cannot read image $in: ", $img->errstr, "\n";
# unlike the transform2() version this works in place
inline_replace_color($img, $from_color, $to_color);
$img->write(file=>$out)
or die "Cannot write image $out: ", $img->errstr, "\n";
=item inline_replace_color
Called:
inline_replace_color($in_image, $from_color, $to_color);
Returns a new image object with colors replaced.
=cut
use Inline C => <<'EOS' => WITH => 'Imager';
void
inline_replace_color(Imager::ImgRaw img, Imager::Color from, Imager::Color to) {
int x, y, ch;
i_color c;
for (x = 0; x < img->xsize; ++x) {
for (y = 0; y < img->ysize; ++y) {
int match = 1;
i_gpix(img, x, y, &c);
for (ch = 0; ch < img->channels; ++ch) {
if (c.channel[ch] != from->channel[ch]) {
match = 0;
break;
}
}
if (match)
i_ppix(img, x, y, to);
}
}
}
EOS
__END__
=back
=head1 REVISION
$Revision: 816 $
=head1 AUTHOR
Tony Cook <tony@develop-help.com>
=head1 SEE ALSO
Imager, Imager::Inline, Imager::API, Imager::Color, Imager::Files
=cut
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