Maintains aspect ratio of thumbnails even if the source image is smaller than the registerd image size
Maintain aspect ratio of media attachments that are smaller than the registered image size. WordPress by default does not resize media attachments that are smaller than the registered image size, that means if you upload a featured image to a post and want to display that image in the same format every time, it won't work if your original image is smaller than the image size registered in your theme.
This plugin won't upscale your Thumbnails but guarantees that the aspect ratio will be maintained!
Important: Your thumbnails format must have the crop setting enabled to be processed by this plugin.
Usage
After you have enabled Thumbnail Upscale plugin, all your future uploaded images will be scaled. For existing images, install and run a Plugin like Regenerate Thumnails Advanced