I am trying to use the brightness adjustment on a grayscale photoshop CS6 file. The preview shows the adjustment working and changes the brightness, but when you click to apply the change, it does not apply the adjustment. I have run into this problem before, although rarely, with some other files over the years and with earlier versions of CS. I would like to know how to overcome this problem?
Make sure you are viewing your image at 100%. At smaller views, pixels and layers and the way they interact are approximate interpolations and won't show you the actual pixel-for-pixel changes.