Currently I'm trying to display .HEIC images in Rails 6. I'm using ActiveStorage ImageMagic to use variant to display jpg. Basically I'm trying to use
mogrify -format jpg myimage.heic
In the image to display jpg.
I added Rails.application.config.active_storage.variant_processor into application.rb to be able to use the variant. However it seems to break in the following line:
<%= image_tag post.image.variant(format: 'jpg'), class: "card-home__img" %>
Why is not working?
You can only call variant on an image that returns true when you call variable? on it.
Internally, ActiveStorage checks if ActiveStorage.variable_content_types contains your image's type. The default supported values are:
image/pngimage/gifimage/jpgimage/jpegimage/pjpegimage/tiffimage/bmpimage/vnd.adobe.photoshopimage/vnd.microsoft.iconimage/webpSo it seems that currently .HEIC images are not supported.
You can instead apply a format transformation before attaching the image to a model or storing it, it might solve your use case.
Raised when ActiveStorage::Blob#variant is called on a blob that isn't variable. Use ActiveStorage::Blob#variable? to determine whether a blob is variable.
Source: https://edgeapi.rubyonrails.org/classes/ActiveStorage/InvariableError.html