Legacy ImageMagick Discussions Archive

Code: Select all

Hi,

Image::Magick (and probably ImageMagick proper) seems rather broken when
working in non-RGB colorspaces. Witness for instance the following
script:

  use Image::Magick;
  my $m = Image::Magick->new(size=>"200x200");
  $m->Read("xc:green");
  $m->Set(colorspace=>'YCbCr');
  $m->Draw(primitive=>"rectangle", fill=>"white", points=>"0,0 100,100"); 
  $m->Write("test.jpeg");

The resulting background is correctly enough green (showing that the
colorspace conversion worked), but the square is pink. This is because
#ffffff in YCbCr is, of course, pink, not white.

I can work around this to some degree, by giving explicit hex codes
to Draw() instead of color names. However, I cannot find a reasonable
way of drawing FreeType text, since drawing black text on a white
background yields ugly green fringes where there should have been grey
pixels (ie. the antialiasing doesn't understand YCbCr either).