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require 'rmagick'
# Demonstrate the Image#crop method
img = Magick::Image.read('images/Flower_Hat.jpg')[0]
# Crop the specified rectangle out of the img.
chopped = img.crop(23, 81, 107, 139)
# Go back to the original and highlight the area
# corresponding to the retained rectangle.
rect = Magick::Draw.new
rect.stroke('transparent')
rect.fill('white')
rect.fill_opacity(0.25)
rect.rectangle(23, 81, 107 + 23, 139 + 81)
rect.draw(img)
img.write('crop_before.png')
# Create a image to use as a background for
# the "after" image.
bg = Magick::Image.new(img.columns, img.rows) { |info| info.background_color = 'none' }
# Composite the the "after" (chopped) image on the background
bg = bg.composite(chopped, 23, 81, Magick::OverCompositeOp)
bg.write('crop_after.png')
exit
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