The image ID field allows you to add a picture for this anime. It will be displayed together with the anime information. You must first download picture to your local disk and then use the image uploader, available from the "Upload" button, to transfer it to the AniDB server. The image uploader generates short image IDs, which look like xxx.jpg (xxx is a number). After uploading a picture in the upload popup, this ID is automatically entered into the relevant field.
:* The maximum allowed size is 400 by 600 pixels. Horizontal banner form images are also allowed up to
600 by 200 pixels, but you are strongly encouraged to use a vertical image instead whenever possible.
:* Don't use animated pictures.
:* The picture must be less than 150 KB in size. If necessary, lower the JPG quality value in your image editor or utilize tools like [https://ezgif.com/optijpeg this JPG optimizer] to meet the required limit.