Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I want to use ImageMagick to edit an existing image by making some selected points a specific colour.
I am trying to use the Draw command with the ‘point’ primitive. However, I can only get a black point regardless of what colour I am trying to set.
This is shown in the Perl code below where:
1. I draw a blue rectangle;
2. Try and set a number of points to white in a rectangle that partly overlaps the blue rectangle.
However, I get black points in the rectangle.
How can I set white (and any other colour) points?
use Image::Magick; my ($col, $img_width, $row, $img_height); # Create a new image my $im = Image::Magick->new(size => '400x300'); # Give it a white background $im->Read('xc:white'); # Put a rectangle in there somewhere $im->Draw(primitive => 'rectangle', points => '0,129 199,169', fill => 'blue', stroke => 'blue'); for($col = 50; $col < 100; $col ++ ) { for ($row = 150; $row < 200; $row ++ ) { $im->Draw(primitive => 'point', points => "$col,$row", stroke => 'white'); } } $im->Write('pointquery.png');

In reply to ImageMagick Point Query by bensonmonk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others rifling through the Monastery: (16)
    As of 2015-07-06 20:45 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (83 votes), past polls