To apply a transformation to all image versions, you can use process_all_versions in Carrierwave.
Here's an example of applying a 'sepia' effect to all versions (the rest is not required, it's a demo only):
class PictureUploader < CarrierWave::Uploader::Base
include Cloudinary::CarrierWave
process_all_versions :cloudinary_transformation => {:effect => :sepia}
process :tags => ['post_picture']
version :standard do
process :resize_to_fill => [100, 150, :north]
end
version :thumbnail do
resize_to_fit(50, 50)
end
end
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