CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-3.2carrierwaveminimagick
diego
diego

Reputation: 123

Carrierwave/Minimagick not processing images after upload

I am having trouble implementing a simple image uploader with Carrierwave/Minimagick gems in RoR.

I'm trying to convert the file to grayscale upon upload, but I am getting an error. Here is the code:

image_uploader.rb:

class ImageUploader < CarrierWave::Uploader::Base

  include CarrierWave::MiniMagick

  # Include the Sprockets helpers for Rails 3.1+ asset pipeline compatibility:
  include Sprockets::Helpers::RailsHelper
  include Sprockets::Helpers::IsolatedHelper

  storage :file

  def store_dir
    "uploads/#{model.class.to_s.underscore}/#{mounted_as}/#{model.id}"
  end

  # Process files as they are uploaded:
   process :convert_to_grayscale

  def convert_to_grayscale
    manipulate! do |img|
      img.quantize(256, Magick::GRAYColorspace)
      img = yield(img) if block_given?
      img
    end
  end

When I try to upload a file, I get the following error:

uninitialized constant ImageUploader::Magick

app/uploaders/image_uploader.rb:36:in `block in convert_to_grayscale'
app/uploaders/image_uploader.rb:35:in `convert_to_grayscale'

I believe this is due to the Magick::GRAYColorspace enum constant. Any ideas why this isnt working?

Upvotes: 0

Views: 1584

Answers (1)

jbatista
jbatista

Reputation: 1002

Is the manipulate function that loads images to memory? Does It return a image list?

I think that the images aren't loaded correctly. The problem isn't the Magick enum.

Here is a sample example:

require 'RMagick'

clown = Magick::ImageList.new("clown.jpg")
clown = clown.quantize(256, Magick::GRAYColorspace)
clown.write('monochrome.jpg')

Upvotes: 1

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