on my site all blogs have a cover image. it is the representative (eye catcher) look for the blog contend. the rest of the images i don't care in the blogs. i thought about this what would the best for the content of the sitemap and the speed of generating all images (i use a cronjob once a day for my image sitemap).
i came to the conclusion that i do not need any image in the blog content except the covers, how can i do this without your first idea of the "Recognize galleries images" because i only need the covers?