win32: taking image from imagemagick via stdout fails on windows

[Zloy]

for some reason generate method in simple.rb takes from stdout of imagemagick not a whole image, but just a part of it. Perhaps the cause of that is text mode operation with stdout. It works if imagemagick writes the image to the file.

[Zloy]

ruby 1.8.6 (2007-09-24 patchlevel 111) [i386-mswin32]

[Zloy]

IO.popen("#{image_magick_command}").binmode.read

solves that issue