Description of the need
Many end-users today do not expect to have to "prepare" images before uploading them. They should be able to crop, rotate, flip, etc. images after they have been uploaded into a system. The "art" of even manipulating an image prior to posting is unheard of to younger audiences, when the primary feature of many photo sharing tools is last minute manipulation on an image through an app or website.
Proposed solution
After uploading an image, you should have basic manipulation tools available to modify that image. I think a tool like https://fengyuanchen.github.io/cropperjs/ provides a good basic set of functionality for crop, rotate, and flip.
An additional library (or a more comprehensive one) that also provides filters may also be desirable, such as http://camanjs.com/examples/ but that one in particular is no longer supported, nor is it a GPL-compatible license.
Alternatives that have been considered
We could always leave this in contrib. Both of these modules exist for Drupal
https://www.drupal.org/project/imageeditor - provides integration with arbitrary image editing software. https://www.drupal.org/project/image_edit - Specific integration with CamanJS
Additional information
Ideally you'd be able to edit an image both immediately after uploading (such as in a dialog) and after uploading from the File management listing (admin/content/files). Perhaps initially we should just worry about one or the other, with the file listing option being the easier one because it would probably just get its own page.
Recent comments
Tim - My specific use case is for situations where a file is "named" by a user or editor incorrectly. If I use the example file name of Emily+Albert.jpg this falls outside of the accepted naming...
Core File module - suggestion
Great, thanks for confirming!
Debian 7 to Backdrop: Infinite loop at the "Overview" step
@tkcent, either way works for testing -- and Github makes it easy to get a patch file. Take the URL to the PR: https://github.com/backdrop/backdrop/pull/5005 Now add '....
Debian 7 to Backdrop: Infinite loop at the "Overview" step