I am using image renditions. I have created some custom image renditions sizes. I have enabled blob cache because it is needed for this functionality. When I add a new item to my list, one of the fields is an publish image. I can select an image and I can select the custom image rendition size.
Everything is working fine here. But sometimes I try to edit an existing saved item. I click on the image. After this you see an extra tab in the ribbon special for the selected image. I see here some button greyed out. Why is it greyed out?
It looks like you can can change the image rendition with this button.