Add the image file name as the value of a new custom field to the post or page
Posts -> Edit -> [Post Title] -> [scroll down to:] Custom Fields -> [scroll down to:] Add new Custom field -> Enter new ->
Name: postheadingimg
Value: myimage23.jpg
-> Click "Add custom field"
... and reference that image in the post kicker at i.e. Post/Page Info Items -> KICKER: Single Post Pages as
PHP Code:
<img src="/path/to/images/%meta('postheadingimg')%" alt="%post-title%" />
Or linked to the single post page
PHP Code:
<a href="%permalink%"><img src="/path/to/images/%meta('postheadingimg')%" alt="%post-title%" /></a>
Additionally, adding a class and ID to each image so they can be group-styled or individually styled:
PHP Code:
<a href="%permalink%"><img id="postheadingimg-%post-id%" class="postheadingimg" src="/path/to/images/%meta('postheadingimg')%" alt="%post-title%" /></a>
CSS Insert:
HTML Code:
/* base style for all */
img.postheadingimg {
border: 5px solid black;
}
/* specifically for post ID 13 */
img#postheadingimg-13 {
border: 5px solid red;
}