frame.rb

require 'rubygems'
require 'RMagick'

size = [85,85]

dst = Magick::Image.read("frame2.svg") {
  self.background_color = 'white'
}.first
  
src = Magick::Image.read('lime.jpg').first
dst = dst.transparent('white', Magick::TransparentOpacity)


[src,dst].each do |src|
  if src.columns > src.rows 
    width = size.first
    height = size.last
    # Wider than tall...use height
      src = src.change_geometry("x#{height}") { |cols, rows, image| 
        image.resize!(cols, rows)
        image.crop! Magick::CenterGravity, 0, 0, width, height
      }
  elsif src.columns < src.rows
    width = size.last
    height = size.first
    #Taller than wide... use width
      src = src.change_geometry("#{width}") { |cols, rows, image| 
        image.resize!(cols, rows)
        image.crop! Magick::CenterGravity, 0, 0, width, height
      }
   elsif src.columns == src.rows
     width = size.first
     height = size.last
     src.resize!(width,height)
     src.crop! Magick::CenterGravity, 0, 0, width, height
  end
end

result = src.composite(dst, Magick::CenterGravity, Magick::OverCompositeOp)
result.write('framed.png')