The Shrine implementation receives an optional image_options which is then used as the options for the image_tag method.
show do
attributes_table do
image_row :photo, image_options: { width: 400 }
end
endTo use the Shrine derivatives you can use the style option with the name of the derivative like the example below. In this case you would need to have a derivative created with the 'jpg_small' name.
index do
image_column :photo, style: :jpg_small
end
