How are image editor settings saved?

[Ernest]

In some scenes, I save the objects and save the scene and when I open it again, the changes I've made in image editor to hues, saturations and gammas of the textures are fine (the way I adjusted them the last time). Other times I save and when I open the scene back again, hues, sats and gammas are in the default position as though they had never been adjusted. I don't really know what I do different in those that save the settings and those that don't but when there are many textures it is so frustrating!

[toby]

any Image editor settings that are applied to an object get saved with the object, including reflection maps. Anything used in the scene but not an object, like compositing, backgrounds, HV and hdri get saved with the scene.