background_color

[Wilaya PointCom]

Hi,

 is it possible to fit with Dragonfly gem an image to a fixed space (500x375 in my case) and fill gaps with specific color ?

I tried many things from here, including something like image.thumb('500x375').process(:background_color => 'white') but it didn't work...

Is there any way?

Thanks a lot for your help.

[Mark Evans]

Hi
not out of the box, but you can create a custom processor to do it.
also you can run arbitrary convert commands using image.convert("….")
Mark

[Wilaya PointCom]

Thanks !

[Wilaya PointCom]

For info, I also followed this source, and it works perfectly (see below code).

Nevertheless, I have a small question, I'm totally new in ruby and I'd like to pass the image size (here 500x375) in parameter.

How would I call it then ??

I tried : 

image_tag p.file.process(:convert_to_canvas_size(500x375)).url

But it didn't work ...

1. config/initializers/dragonfly.rb

require 'image_processor'
        app = Dragonfly[:images]
        app.processor.register(ImageProcessor)

2. image_processor.rb

class ImageProcessor

    def convert_to_canvas_size_500x375(temp_object)

        tempfile = new_tempfile

        args = " #{temp_object.path} -resize 500x375 -gravity center -background grey -extent 500x375 #{tempfile.path}"

        full_command = "convert #{args}"

        result = `#{full_command}`

        tempfile

    end

    

    private

    

    def new_tempfile(ext=nil)

        tempfile = ext ? Tempfile.new(['dragonfly', ".#{ext}"]) : Tempfile.new('dragonfly')

        tempfile.binmode

        tempfile.close

        tempfile

    end

end

3. call it :

image_tag p.file.process(:convert_to_canvas_size_500x375).url