It's great to hear that you're interested! Btw, here is the 
PR: https://github.com/rails/rails/pull/32471

Once Rails 5.2 is released, we can discuss plans of getting this in for 
Rails 6.0.

On Friday, April 6, 2018 at 7:34:21 PM UTC+2, DHH wrote:
>
> 5.2 ship has indeed sailed. We're very close to a final release after 
> months of RC'ing. I don't think it's a big issue maintaining the 8 lines of 
> code that's related to using MiniMagick for transformations: 
> https://github.com/rails/rails/blob/master/activestorage/app/models/active_storage/variation.rb#L59-L67.
>  
> We have to weigh that against taking on another dependency. On that note 
> alone, I don't think the trade is worth it. But I do like the idea of 
> having easier access to common transformations. And it also sounds nice to 
> have a faster way of doing the transformations.
>
> Happy to see us target a refactoring for Rails 6.0 on this šŸ‘
>
>
> On Thursday, April 5, 2018 at 9:07:34 AM UTC-7, Janko Marohnić wrote:
>>
>> Thanks for sharing your thoughts. I was hoping that ImageProcessing would 
>> be able to replace the mini_magick gem, as that would allow removing a lot 
>> of code. Having the option for ImageProcessing to be an optional upgrade 
>> would mean the Rails team would still have to keep and maintain the 
>> pure-MiniMagick code, which would be less than ideal as there is no 
>> advantage in using pure MiniMagick. Note that switching to ImageProcessing 
>> should still retain 100% compatibility with the current ActiveStorage API, 
>> from what I've observed.
>>
>> If Rails 5.2 ship really has sailed, then I don't see a way how we'll be 
>> able to replace the MiniMagick code later on without breaking backwards 
>> compatibility, as at the moment MiniMagick is an optional dependency. Only 
>> if we make ImageProcessing a *runtime* dependency instead of optional, 
>> but ImageProcessing pulls in both mini_magick and ruby-vips gems (though it 
>> does not require them).
>>
>> On Thursday, April 5, 2018 at 5:52:29 PM UTC+2, DHH wrote:
>>>
>>> I like that an idea as an optional upgrade. The Rails 5.2 ship has 
>>> already sailed, so we'll want to make sure that any optional upgrade honors 
>>> the existing transformation API. But I could see making the 
>>> Variation#transform call a strategy that's configurable. And it'll just 
>>> start with what we have now, but can be upgraded/replaced with this 
>>> solution.
>>>
>>> On Wednesday, April 4, 2018 at 5:18:25 PM UTC-7, Janko Marohnić wrote:
>>>>
>>>> Hello everyone,
>>>>
>>>> ActiveStorage performs image processing on-the-fly, and for that it 
>>>> currently uses raw MiniMagick. As we can see from CarrierWave 
>>>> <https://github.com/carrierwaveuploader/carrierwave/blob/master/lib/carrierwave/processing/mini_magick.rb>
>>>>  
>>>> and Refile <https://github.com/refile/refile-mini_magick>, for common 
>>>> image resizing it's not enough to just use simple ImageMagick options, 
>>>> certain resizers like "resize_to_fill" require a combination of 
>>>> ImageMagick 
>>>> options to achieve the desired effect.
>>>>
>>>> To avoid reimplementing this functionality, I propose that 
>>>> ActiveStorage uses the *ImageProcessing* 
>>>> <https://github.com/janko-m/image_processing> gem, as a layer on top 
>>>> of MiniMagick. The ImageProcessing gem has been developing for almost 3 
>>>> years now, and it's gotten pretty good. It was primarily written to be 
>>>> used 
>>>> with Shrine <https://github.com/shrinerb/shrine>, but I deliberately 
>>>> made it generic so that other file attachment libraries can use it as well 
>>>> and avoid reimplementing the same functionality.
>>>>
>>>> Some features that are added on top of MiniMagick:
>>>>
>>>>    - resizing macros:
>>>>       - #resize_to_limit 
>>>>       
>>>> <https://github.com/janko-m/image_processing/blob/master/doc/minimagick.md#resize_to_limit>
>>>>       - #resize_to_fit 
>>>>       
>>>> <https://github.com/janko-m/image_processing/blob/master/doc/minimagick.md#resize_to_fit>
>>>>       - #resize_to_fill 
>>>>       
>>>> <https://github.com/janko-m/image_processing/blob/master/doc/minimagick.md#resize_to_fill>
>>>>       - #resize_and_pad 
>>>>       
>>>> <https://github.com/janko-m/image_processing/blob/master/doc/minimagick.md#resize_and_pad>
>>>>    - automatic orientation 
>>>>    
>>>> <https://www.imagemagick.org/script/command-line-options.php#auto-orient>
>>>>    - automatic thumbnail sharpening 
>>>>    
>>>> <https://github.com/janko-m/image_processing/blob/master/doc/minimagick.md#sharpening>
>>>>    - avoids the complex MiniMagick::Image class
>>>>
>>>> But probably the biggest features of the ImageProcessing gem is that it 
>>>> also ships with the *libvips* <http://jcupitt.github.io/libvips/> 
>>>> backend. Libvips is an alternative to ImageMagick. The advantage of using 
>>>> libvips is that in most cases it's* multiple times faster than 
>>>> ImageMagick*. This is a big deal.
>>>>
>>>> The ImageProcessing gem provides a uniform API regardless of which 
>>>> backend is used, just the operations/options specific to ImageMagick and 
>>>> libvips differ of course. That means the potential ActiveStorage 
>>>> integration would work for both ImageMagick and libvips, allowing the user 
>>>> to swap backends with just a single line of code.
>>>>
>>>> So, my question is: would you be open to accepting a pull request that 
>>>> replaces MiniMagick with ImageProcessing?
>>>>
>>>> Kind regards,
>>>> Janko
>>>>
>>>

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