Example of defining image output sizes

image_field.rb

class Photo < Piece
  field :image do
    # Define a list of outputs that will be generated for each image
    size :large do
      # Here you have access to a minimagick context which can be used to 
      # apply any ImageMagick process to your uploaded image.
      # https://github.com/minimagick/minimagick
      fit 640, 360
    end

    size :black_white do
      fit 640, 360
      greyscale
    end

    size :thumbnail do
      crop 100, 56
    end
  end
end

# To use these images within your templates you simply suffix the field name with the size:
#
#    ${ image.black_white }
# => <img src="/media/00045/00345/image.black_white.jpg" alt="" />
#
#    background-image: url(${ image.thumbnail.src }); width: ${ image.thumbnail.width }px;
# => background-image: url(/media/00045/00345/image.thumbnail.jpg); width: 100px;