You can create a new metakey where you will enter the url, take a look at UserManual
, page 214. Then you can use this link to open a new page. If you use Image Gallery control you can open the image in new window, but id depends on the mode you use. Generally you could override SetItemMetadata method from where you can access the "download link" that shows the image and set Target property.
HyperLink downloadLink = itemContainer.FindControl(
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