When I have images uploaded to Wordpress, there is no way for me to flexibly edit these images. For example, let's say I want to add a colored overlay over an image that has been uploaded to Wordpress. For me to do this, I have to add the overlay to the image, then upload the new modified image to Wordpress. When I am developing a non-Wordpress site, however, all I have to do is link to the photo in the CSS, then using the Image Assets generator, the linked image is changed on the fly. This saves me from having to re-upload photos every time I make a change.
Is there any Photoshop script or plugin, or just a method in general for editing photos without having to re-upload them to Wordpress?