<meta name=’myImageFieldMetaTag’ content=’<SharePointWebControls:FieldValue FieldName="myImageField" runat="server" id="myImageFieldId"/>’ id="myImageFieldMetaTagId" />
What about SharePoint 2013?
I haven't tried it yet, but it seems like it's supported in the new version.
All site columns that contain values will automatically become managed properties when they're crawled. A publishing image field is one of them and will be crawled with the following name syntax:
Crawled property name: ows_q_IMGE_SiteColumnName
Managed property name: SiteColumnNameOWSIMGE
I'm not sure yet, if I like the auto generation. Those names are not that userfriendly, but yes... it doesn't matter in this case.
Reference: Automatically created managed properties in SharePoint Server 2013