I am using auto tone as a starter point to process my images. For some indoor pictures lightroom produce images with negative contrast values (like -30) which I don't like. When I select the images that I want to manually enter a contrast value and sync them, Lightroom indicates that it process the request, but when I go to an image that was already synced, the auto tone continue to work and put the contrast value back to negative 30. How do I disable AUTO TONE after I first process the images? I tried to turn on AUTO SYNC and disable auto tone but it doesn't seem to disable it.