Force WordPress to resize to sizes larger than original an image when cropping
An snippet to force WordPress to upscale an image if necessary to fit dimensions provided in
add_image_size() when cropping. It will fire both when uploading a new image and through a
media regenerate call using wp-cli.
View the code on Gist.
Caveats: it needs lots of ram and a lot of storage.
Forther info in this answer by levi at Stack Overflow.