Redmine

The correct syntax should of course be:

!MyWikiPage:myimage.png!

What about this feature? I need it...

I need syntax like this:

![[MyWikiPage]]:myimage.png!
!#IssueID:myimage.png!
!project:[[MyWikiPage]]:myimage.png!
!project:#IssueID:myimage.png!

+1 for this.

"![[MyWikiPage]]:myimage.png!" 
"#IssueID:myimage.png!" 
"project:[[MyWikiPage]]:myimage.png!" 
"project:#IssueID:myimage.png!"

For us, some page has regularly updated image data (graphs) which we need to link to other pages. As the image ID changes every time new image is updated - links are broken for new uploaded image.

There is a workaround - you can store this files at some ftp and http service and link to them, BUT built in solution is needed.

I would also suggest Redmine team to implement a solution, that allows users to PAY for features they need in stock system.
I understand, that Redmine is a free product, but user payments will show what is REALLY required. Team will be motivated to implement such feature faster. Even hire extra devs to implement, using given resources, if needed.