Rails 'link_to' to Download An Image Immediately Instead of Opening it in the Browser

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I have a link_to Rails helper that downloads a wallpaper when clicked. But the image is loading in the browser instead of being downloaded immediately.

<%= link_to "1920x1080", @download.wallpapers[1].wallpaper.url %>

But at the same time I have a link_to Rails helper that downloads a screensaver of .exe format but here it works as inteded: file being downloaded immediately.

<%= link_to "720p", @download.screensavers.first.screensaver.url %>

What should I add or do so that the images will not be opened in the browser but instead be downloaded immediately?

Thanks!

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