gistfile1.txt

MiniMagick::Tool::Mogrify.new do |mogrify|
  mogrify.resize("100x100")
  mogrify.negate
  mogrify << response[:picture][:data][:url]
end

image = MiniMagick::Image.new(response[:picture][:data][:url]) do |b|
  b.resize "250x200>"
  b.rotate "-90"
  b.flip
end


image = MiniMagick::Image.new(cover) do |b|
  b.resize "250x200>"
  b.rotate "-90"
  b.flip
end

MiniMagick::Tool::Convert.new(cover) do | new_image |
  new_image.border "2x2"
end

collage = MiniMagick::Image.create("png") do |c|
      c.size "1024x768"
      c.canvas "white"
end

first_image  = MiniMagick::Image.new("first.jpg")
second_image = MiniMagick::Image.new("second.jpg")
result = first_image.composite(second_image) do |c|
  c.compose "Over"    # OverCompositeOp
  c.geometry "+20+20" # copy second_image onto first_image from (20, 20)
end
result.write "output.jpg"

logo.combine_options do |c|
  c.draw "image Over 0,0 100,100 'output.jpg'"
  c.thumbnail "300x500>"
  c.background "blue"
end

logo.combine_options do |c|
  c.draw "image Over 0,0 100,100 '/var/folders/z1/fs8bm1wj0vx0cfw_hsfv82rh0000gn/T/mini_magick20180406-4158-pjyhjp.jpeg'"
  c.thumbnail "300x500>"
  c.background "blue"
end


cover = MiniMagick::Image.read(open(response[:cover][:source]).read)
logo = MiniMagick::Image.read(open(response[:picture][:data][:url]).read)
logo.resize("#{size * 0.35}x#{size * 0.35}")   
cover.combine_options do |c|
  c.draw "image Over 50,50, 600,600 '#{logo.path}'"
  c.thumbnail "500x500>"
  c.background "red"
  c.border "1.5x1.5"
  c.bordercolor "#FFF"
  c.border "1.5x1.5"
  c.bordercolor "#000"
end
cover.write('ff.png')

MiniMagick::Tool::Convert.new do | new_image |
  new_image.size "1024x768"
  new_image << "output.jpg"
end

https://gist.github.com/artemave/c20e7450af866f5e7735