# OgImageOptions 
type OgImageOptions =
    {
        FrontMatterKeys: string list
        AltKeys: string list
        Fallback: Page -> OgImage option
        Default: OgImage option
        ExcludeCollections: string list
    }
| | | |---|---| | Assembly | `Partas.Nacara.Plugins.OgImage` | Options of the og-image plugin. ## Fields 
FrontMatterKeys: string list
The front matter keys a page names its image under, first match wins. The value is a path or url, or a mapping with `url`, `alt`, `width` and `height`. `false` opts the page out, fallbacks included. Defaults to `[ "og_image"; "ogImage"; "image" ]`. 
AltKeys: string list
The front matter keys the image's alt text is read from, beside a plain path. Defaults to `[ "og_image_alt"; "ogImageAlt"; "image_alt" ]`. 
Fallback: Page -> OgImage option
The image of a page whose front matter names none. Asked before `Default`, so a collection or a section can have its own card: `fun page -> if page.Collection = "blog" then Some(OgImage.image "/blog-card.png") else None`. Defaults to `fun _ -> None`. 
Default: OgImage option
The image of every page nothing else gave one. Defaults to `None`, which leaves such a page without an image. 
ExcludeCollections: string list
Collections whose pages get no image at all. Defaults to `[]`.