From /usr/share/doc/perlmagick/examples/demo/single_pixels.pl on Ubuntu 10.04.1:
#!/usr/bin/perl
#
# 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');
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.