This means you won’t see any harsh brush strokes as sometimes happens when applying masks via the brush tool in Photoshop. The best part about using luminosity masks is that they are self feathering, as is the nature of light. The goal is to choose the channel that is completely black for all the stars, and mostly white and / or grey for the areas which you want to apply noise reduction. Step 5: Determine the channel you want to use for noise reduction. Having a visual representation of each channel is the only way to select the right channel for your specific image. This is why an automated workflow such as actions really help. Since each photo you edit will contain different levels of luminance, the same channel won’t be used to apply noise reduction each time. In doing so you’ll be able to see which selection best fits your specific photo. Technically, you could create infinite selections of darker and darker regions of the histogram, but this isn’t necessary. ![]() PRO TIP: When creating the darks channels it’s best practice to create the dark channel first, then create 4-5 additional channels, which subsequently select darker and darker regions of the photo / histogram. You can also use my Star Photography Photoshop Actions for this step. Step 4: Open the “Channels Module” in Photoshop and create new luminosity channels. Step 3: Open the Photoshop noise reduction program of your choice and run it on the new layer from step 2. This will give you a top layer that is identical to the combination of all underlying layers. Step 2: Use Shift+Alt+Command+E ( Mac ) or Shift+Alt+CTRL+E ( PC ) and merge all to new layer. Photoshop noise reduction, using either Nik Define or Imagenomic, should always be the last step. Step 1: Always finish your photo editing process prior to using noise reduction software. You can use my methods in the tutorial with either software. Imagenomic Noise Reduction – I consider this to have a slight edge on Nik, but not much. That’s the program used for noise reduction in the video. Nik Software Suite ( Now Free ) – Click Download on top right of page. Nik Define comes as part of the software suite. I created and use these to edit all my star photos, I think you’ll love them too! ![]() There is another video included with the link above showing you exactly what they are all about. Star Photography Photoshop Actions & Video Tutorials: These are the actions I showed at the end of the video. Watch the video first, then follow these steps for quick reference.
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