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.
Image
field in another list is always disabled.