[magick-users] stream correction

[duc.sequere.aut.de.via.decede at imagemagick.org]

>  I tried this, but the colors seem to be coming back inverted:

What version of ImageMagick are you using?  We're using 6.5.1-5 and get the
expected results:

  stream -map rgb -storage-type char -extract 300x300+200+100 logo: logo.rgb
  convert -depth 8 -size 300x300 rgb:logo.rgb logo.jpg
  display logo.jpg

Where logo.jpg is a portion of the ImageMagick wizard in its original colors.