Image Resize and Crop Algorithm In MiniMagick

Question

I'm running a rails app that accepts user screenshots. We are looking to generate smaller versions of the screenshots in a very specific dimension (652x408. Why that? ask the front end guy.) We are using Carrierwave and Minimagick currently to accomplish this.

I've tried the resize_to_fill and resize_to_fit resize methods, but they always leave some whitespace with inputs. I'm trying to resort to my own custom one, but I'm pretty lost on the imagemagick syntax.

Anyway, I'm trying to implement this, but I have no idea the best way to go about it. Is there a standard algorithm for this kind of thing?

Answer 1

You can use Jcrop and Carrierwave to crop image. Like this effect

Here is some code https://github.com/luckyyang/imagecrop But it's use Paperclip instand of Carrierwave.

In carriewave, there is some code

  version :thumb do
    process :crop
    resize_to_fill(240, 320)
  end

  # crop image
  def crop
    if model.crop_x.present?
    resize_to_limit(1280, 1280)
    manipulate! do |img|
      x = model.crop_x
      y = model.crop_y
      w = model.crop_w
      h = model.crop_h
      img.crop("#{w}x#{h}+#{x}+#{y}")
      img
    end
  end
end

I feel apologetic with my bad English. I hope this can help you