Tired opening many images, convert it to jpg before sharing it with your friends? This ruby script use minimagick to read images and write it where you want. In general, the file name has a base like "IMG" + "(n+1)". Thus the script auto increment the last part, convert and write the correspondent name.

raw_image_to_jpg.rb

require 'mini_magick'

#Criar script IMG_#{numero + 1} for each loop
initial_number = 3746
final_number = 3774
image_name = ""
image_name_converted = ""

while initial_number < final_number
    initial_number = initial_number + 1
    p image_name = "IMG_" + "#{initial_number}" + ".CR2"
    p image_name_converted = "IMG_" + "#{initial_number}" + ".jpg"
    image = MiniMagick::Image.open("C:/path/to/open/#{image_name}")
    p image.path
    image.write("C:/path/to/write/#{image_name_converted}")
    p "Image converted and saved at C:/Users/alpar/Desktop/paulo_e_louis_jpg/"
end