Replace images with Ruby?

If I had a folder full of thousands of images that were all the same size, could I take 1 image and replace all the others with that image (but retain the file names) with Ruby?

If so, how would you do 开发者_运维百科that exactly?

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First off, if I understand your question you wish to do this:

1. Take a directory with dog.jpg (image of a dog), cat.jpg (image of a cat) and horse.jpg (image of a horse)
2. Choose dog.jpg as your source image
3. Replace the image of a cat and horse with a dog while keeping their filenames
4. Resulting in a directory with dog.jpg (image of a dog), cat.jpg (image of a dog) and horse.jpg (image of a dog)

You could use a function like this,

require 'FileUtils'

def operate_on_directory(source_image, extensions)
  Dir.glob("*.{#{extensions.join(',')}}") do |file|
    FileUtils.cp(source_image, file) unless file == source_image
  end
end

operate_on_directory("dog.jpg", ["jpg", "png"])