No thumbnail is generated for image

[papakay]

I was able to generate thumbnail from video but thumbnail was not generated for images.

I have Imagick 7.0.0.6 installed.

My code was this

Thumbnex.create_thumbnail("uploads/reviews/source/photos/gtbank-mobile-app-is-great-and-innovative-24160680-e8b3-4e0b-81b0-739d23dfb93d-0.3911392694825596.jpg", "uploads/test.jpg", max_width: 640, max_height: 400)

Please what are mine doing wrong?

Thanks.

[talklittle]

What's the error message?

[papakay]

I didn't get any error message but after several retry it worked. However i observed that when i specify width and height, it doesn't generate the exact dimension. Is there a way to achieve this please?

[talklittle]

Did you use :width and :height for the width/height (instead of :max_width and :max_height)?

Please paste the command you used.

[papakay]

I used this

Thumbnex.create_thumbnail("uploads/reviews/source/photos/gtbank-mobile-app-is-great-and-innovative-24160680-e8b3-4e0b-81b0-739d23dfb93d-0.3911392694825596.jpg", "uploads/test.jpg", width: 640, height: 400)

[papakay]

I got a dimension of 605 x 400

and the source dimension is 800 x 529

[papakay]

Please i'm about 3 weeks old in elixir and I would like to know whether my approach with Thumbnex is correct.

I have a form that allows user upload multiple files. And I will like to use thumbnex to generate the thumbnail after the upload. I have implemented it this but i noticed no thumbnail is generated with this approach.

Kindly see my code below.

        review = Repo.get!(Review, review_id)
        Enum.each Map.get(attachment_params, "attachment"), fn attachment ->
            media_type =
              case attachment.content_type do
                "image/jpeg" -> "photos"
                "image/png" -> "photos"
                "image/gif" -> "photos"
                "image/jpg" -> "photos"
                "video/mp4" -> "videos"
                _   -> nil
              end
            extension = Path.extname(attachment.filename)
            unqiue_identifier = :rand.uniform()

            media_source_filename = "#{media_type}/#{review.slug}-#{review.id}-#{unqiue_identifier}#{extension}"
            upload_path = "uploads/reviews/source/#{media_source_filename}"

            # Thumbnail
            media_thumbnail_filename = "#{media_type}/#{review.slug}-#{review.id}-#{unqiue_identifier}.jpg"
            thumbnail_path = "uploads/reviews/thumbnail/#{media_thumbnail_filename}"

            File.cp(attachment.path, upload_path)

            Thumbnex.create_thumbnail(upload_path, thumbnail_path, width: 600, height: 400)

        end

[talklittle]

Regarding the width/height, the resize operation preserves the aspect ratio. If you need to do additional image manipulations like stretching/cropping, you should use another library in addition to Thumbnex. Such as Mogrify.

Actually, if all you are doing is working with images and not videos, I recommend you work with Mogrify instead of using Thumbnex at all. Mogrify provides a lot more flexibility. I guess Thumbnex is more useful with animations and videos.

[papakay]

Thank you so much. I really appreciate this.