When new image sizes are added in the theme using Image Size option under Dashboard > Jupiter > Control Panel > Image Size in Jupiter theme, it only applies to the newly uploaded images. In that case, the old images need to be updated with the new dimensions before it’s visible in the page/posts. The thumbnails can be regenerated using the Regenerate Thumbnails plugin.
In this article we’ll explain about regenerating thumbnails using the regenerate thumbnails plugin.
Installing the Plugin
The plugin allow you to regenerate all images at once as well as individual thumbnail images.
Regenerate All Thumbnails at Once
Regenerate a Specific Image
You can regenerate specific images (rather than all images) from the Media page.