Custom images are Linux and Unix-like images you import to DigitalOcean. You can create Droplets based custom images, which lets you migrate and scale your workloads without spending time recreating your environment from scratch.
To delete a custom image via the control panel, click Images in the main navigation, then click the Custom Images tab.
Click the More menu for the custom image you want to delete, then choose Delete. A confirmation window titled Confirm delete item opens. Click Delete Item to confirm the deletion
Droplets you've created from a custom imgae are not deleted when you delete the image from your account. You can destroy Droplets from the control panel separately.