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I’ve been working on a project that requires me to watermark all my images. Here’s a script I put together using rmagick. I plan on releasing a skeleton application that will accept uploaded files and watermark them.
Ideally, I’d like to use paperclip to handle uploading, and write a processor subclass to handle watermarking…unfortunately I’m running into some issues. If anybody wants to lend a hand, I have the public repository up at: http://github.com/ng/paperclip-watermarking-app/tree
require 'RMagick' # load source and watermark images src = Magick::ImageList.new("source-image.jpg").first watermark = Magick::Image.read("watermark-image.png").first # create a new, blank image with a height that is the sum of # the source and watermark dst = Image.new(src.columns, src.rows+watermark.rows) { self.background_color = 'white' } # place the source image on the blank image result = dst.composite(src, Magick::NorthGravity, Magick::OverCompositeOp) # place the watermark over the previous transformation result = result.composite(watermark, Magick::SouthEastGravity, Magick::OverCompositeOp) # write it out result.write('watermarked-image.jpg')
