My friend sent me a psd file that he had already worked on.
The file has a background, a regular layer with some adj. and 3 adj. curves.
When we flatten the image, the image will go lighter.
The first thing to do is to view the file at 100%, which is the only size at which the rendering is guaranteed accurate. Now does the same thing happen when you flatten the file when viewing at 100%?
I have experienced this, and was advised as above in an Adobe forum. At 100%, the rendering remained the same when I flattened. As I recall, the edits I made were correct, and they showed correctly at 100%.