Hi, I have 3 layers in a Photoshop CC document and I want to stack them in order to reduce the noise in the sky. To do this I used the following method Mask out everything except the sky, selected all layers then auto aligned - This didn't work The second method (Milky Way Exposure Stacking with Manual Alignment (Noise Reduction) in Adobe Photoshop - YouTube ) was masking out the layers again then having the bottom layer as "normal" and the above layers as "difference" then a mixture of transform tools and various warping methods - this, unfortunately, didn't work. I think the reason why is although the photos were all taken in the exact same place the stars had rotated over that period of time - I'm stuck and need some advice on how to do this properly, I've tried using bright luminosity masks to select the bright stars then auto-aligning but alas the auto align didn't pick up on it. Help! Ps I'm on a Mac so can't use any other third party alignment programs
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