Modern cameras often produce JPEGs that have a "I should be rotated 90° to the left" flag. If you process such pictures using Carrierwave this will be ignored and you'll end up with a wrongly rotated image.

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Fortunately, this is easy to fix:

In your Uploader, add

process :auto_orient # this should go before all other "process" steps

def auto_orient
  manipulate! do |image|
    image.tap(&:auto_orient)
  end
end

Note: You can add the process :auto_orient outside of all your version blocks and it will apply to all of them.