Sibling monks, I have a whole load of button images and what not, and I'm changing the colour scheme of a web site, and all I want to do is change every black pixel into a blue pixel, and then every grey pixel into a red one. Shd be easy? But I can't work out how to do it. Image::Magick seems to do everything else. But Colorize doesn't do what I want - e.g. I tried 
use Image::Magick;
my $image = Image::Magick->new;  
my $file = $image->Read('old.gif');
$image->Colorize(color => '#000000', fill => '#0000ff'); 
$image->Write('new.gif');

[download]
... and got an all blue image, rather than the same image but with the black lines in blue.

And I can't see anything else that might. I'd be most grateful if a kind monk cd tell me how to do this.

§ George Sherston

In reply to Changing image colours - Image::Magick? by George_Sherston

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!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.