Find only those galleries with images

I believe that a relatively simple meta_query would do it.

$args = array(
    'post_type' => 'post',
    'meta_query' => array(
        array(
            'key' => '_gallery_image_ids',
            'value' => '',
            'compare' => 'EXISTS'
        )
    )
);
$query = new WP_Query( $args );

Reference:

http://codex.wordpress.org/Class_Reference/WP_Query#Custom_Field_Parameters

Related Posts:

  1. Display images with same specific value?
  2. Is it possible to query all posts that don’t have an attachment?
  3. How to paginate wordpress [gallery] shortcode?
  4. How to get Page/Post Gallery attachment images in order they are set in backend using WP_Query()?
  5. Count the number of images uploded on the website
  6. How to paginate attachments in a secondary query as gallery?
  7. How do I exclude all images from a wp_query?
  8. Get attachment by slug
  9. get images attached to post
  10. How to display images in related posts?
  11. post thumb nail
  12. query attachments of parent page if attachments of current page are smaller than …
  13. wp_query for displaying attachments with a tag
  14. WP Query search for attachments and their exact title
  15. Gallery shortcode numerical sorting
  16. Better wordpress attachment query than this
  17. How to add WordPress featured image via SQL
  18. Display all attached image of every post of custom post type and link to original post
  19. Insert images into wordpress post with a query
  20. WP_Query: attachment image in “full” size?
  21. Change database image location for transportability
  22. WP query retrieve the src of attached image
  23. Trying to use “Medium” featured image for custom post type on home page
  24. wp_get_attachment_image not to get the post_thumbnaill
  25. How To Query All Attachment Images Found In Post Galleries
  26. Some images not being returned with wp_get_attachment_image
  27. Pull Instagram images into an existing loop?
  28. Way to include posts both with & without certain meta_key in args for wp_query?
  29. How to trigger 404 for custom query var?
  30. Can I load posts via Ajax?
  31. How can I use WP-CLI commands without –allow-root
  32. Calling a wp_query $posts causes a 500 error
  33. WP_query taxonomy + get all posts with two terms from same taxonomy
  34. How do I create my own nested meta_query using posts_where / posts_join?
  35. meta_query not working properly
  36. Best Practice For Querying Grandchildren?
  37. Using tax_query reverses my post_type argument in a custom WP_Query
  38. creating wp query with posts with specific category
  39. $wp_query->current_post restarts from zero on paged pages
  40. wp_get_post_terms of cpt but not duplicates if they are used more than once in the loop
  41. How to prevent queried posts from being added to cache?
  42. How to make orderby ‘meta_value_num’ OPTIONAL?
  43. How to do a query on custom taxonomies that is uncategorised?
  44. How can I query posts with newly uploaded images?
  45. Conditional arguments WP_Query for post custom fields
  46. Random loop with code to prevent duplicate output returns no output at all from time to time
  47. Single meta_query query using OR instead of AND in request’s WHERE statement
  48. How to change the target size of images clicked on in WordPress standard gallery
  49. How to choose between hooking into per_get_posts or into parse_query
  50. Woocommerce returns Product post_status as published even tho it is in status draft
  51. remove query arg from url after set query
  52. How to loop for every result found in the_content() when using the search query?
  53. How can I fix: “Notice: Undefined offset: 0”?
  54. SQL: What is wrong with the following query (generated by WordPress WP_Query, ordering prices)
  55. Order By table field comment_status in WordPress > 4.0
  56. Slow WP_Query for custom post type
  57. WP_Query Pagination on multiple-loop page breaks WP or doesn’t show up
  58. Using hook to use DISTINCT in a wp_query
  59. Overwrite YoastSEO meta-tags with another page’s [closed]
  60. Import wp users via one click demo option
  61. How to restrict the search fields for a specific post type
  62. Slow queries on a huge database
  63. Pagination links missing for first link (1) and previous button? How to get pagination links to work?
  64. Query with relation and one without relation using multiple taxonomies?
  65. Automatically Query Parent Taxonomy
  66. Shouldn’t I be able to modify the main query by this filter?
  67. WP Query crashes on more than ~ 2000 posts
  68. different for loop if screen resolution < 1000px
  69. insert value from html into data base with wordpress
  70. Debugging wp_query orderby for taxonomy
  71. Get all posts which was posted on X Days WordPress
  72. Pagination is not working with custom query inside a homepage template
  73. How to load a script code only in posts?
  74. Display posts with specific value first in query
  75. wp_query comment and meta query
  76. I need to run a AJAX Fuction from within a WP_Query but only works on first item
  77. How to change tag based on metabox value within $wp_query
  78. What’s missing in this wp_query and meta_query
  79. Tax Query on product_cat using NOT IN as operator does not exclude that category
  80. How to use the Term Object from a custom select field in a query
  81. Random users always showing same 8 users
  82. whether a nonce is required for get type and get_query_var?
  83. Wp-query and column blocks
  84. How to query users by post count no less than 10
  85. Display 3 levels of categories on page
  86. Showing most popular post of week
  87. Related Post by Tags Code
  88. Display three sequential posts on each page load, without repeating previous
  89. Find by post_meta, then sort by post_meta, then sort by date (wp_posts)
  90. Optimising amount of calls to custom fields
  91. The sorting of posts by a meta_query with two keys fails while separated as single queries it works
  92. Hierarchical List Pages as a table
  93. WP_Query with several meta_query-statements and order by meta_value
  94. Second wp_query doesn’t appear to be working
  95. difference between methods of query
  96. post__in not recognizing multiple IDs
  97. Related posts with WP_Query
  98. I want to place a post before all others from an ACF boleen field
  99. How to put posts with some taxonomy on top of others in `pre_get_posts`
  100. wp_query, calculate with two dates when ‘key’ is text format