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PATH: usr / share / doc / ImageMagick-perl-6.9.10.68 / demo

#!/usr/bin/perl

eval 'exec /usr/bin/perl  -S $0 ${1+"$@"}'
    if 0; # not running under some shell
#
# Methods for to Get and Set single pixels in images using PerlMagick
#
use strict;
use Image::Magick;

# read image
my $im=Image::Magick->new();
$im->Read('logo:');

# ---

# Get/Set a single pixel as a string
my $skin=$im->Get('pixel[400,200]');
print "Get('pixel[x,y]') = ", $skin, "\n";

$im->Set('pixel[1,1]'=>'0,0,0,0');
$im->Set('pixel[2,1]'=>$skin);
$im->Set('pixel[3,1]'=>'green');
$im->Set('pixel[4,1]'=>'rgb(255,0,255)');

# ---

# More direct single pixel access
my @pixel = $im->GetPixel( x=>400, y=>200 );
print "GetPixel() = ", "@pixel", "\n";

# modify the pixel values (as normalized floats)
$pixel[0] = $pixel[0]/2;      # darken red value
$pixel[1] = 0.0;              # junk green value
$pixel[2] = 0.0;              # junk blue value

# write pixel to destination
# (quantization and clipping happens here)
$im->SetPixel(x=>5,y=>1,color=>\@pixel);

# ---

# crop, scale, display the changed pixels
$im->Crop(geometry=>'7x3+0+0');
$im->Set(page=>'0x0+0+0');
$im->Scale('1000%');

# Output the changed pixels
$im->Write('win:');
$im->Write('single-pixels.gif');

[-] steganography.pl [edit]
[-] Turtle.pm [edit]
[-] composite.pl [edit]
[-] src.png [edit]
[-] shadow-text.pl [edit]
[-] model.gif [edit]
[-] demo.pl [edit]
[+] ..
[-] piddle.pl [edit]
[-] README [edit]
[-] shapes.pl [edit]
[-] pink-flower.gif [edit]
[-] yellow-flower.gif [edit]
[-] dst.png [edit]
[-] tree.pl [edit]
[-] annotate.pl [edit]
[-] compose-specials.pl [edit]
[-] pixel-fx.pl [edit]
[-] button.pl [edit]
[-] tile.gif [edit]
[-] single-pixels.pl [edit]
[-] settings.pl [edit]
[-] annotate_words.pl [edit]
[-] Makefile [edit]
[-] red-flower.gif [edit]
[-] lsys.pl [edit]
[-] smile.gif [edit]