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Reducing color noise with Color

From: Photoshop Blend Mode Magic

Video: Reducing color noise with Color

One of the things that can happen when you shoot a digital image is you can sometimes get color noise artifacts. If I zoom into 100% here, Command+1, Ctrl+1, you can see right away in the shadow areas, we are seeing this random red, green, and blue pixels muddying up our shadows. This can happen when you are shooting with high speed ISO or with the Telephoto Lens in low light or a couple of different scenarios there. What we want to do is get rid of the Color Noise here and just eliminate it so we see the image instead of seeing the distracting colors here. So to begin, we are going to go ahead and duplicate this layer. I want to name the duplicate as I make it, so Command+Option+J or Ctrl +Alt+J. We'll go ahead and name this Remove Color Noise. Great, and then we are going to set our blend mode to Color.

Reducing color noise with Color

One of the things that can happen when you shoot a digital image is you can sometimes get color noise artifacts. If I zoom into 100% here, Command+1, Ctrl+1, you can see right away in the shadow areas, we are seeing this random red, green, and blue pixels muddying up our shadows. This can happen when you are shooting with high speed ISO or with the Telephoto Lens in low light or a couple of different scenarios there. What we want to do is get rid of the Color Noise here and just eliminate it so we see the image instead of seeing the distracting colors here. So to begin, we are going to go ahead and duplicate this layer. I want to name the duplicate as I make it, so Command+Option+J or Ctrl +Alt+J. We'll go ahead and name this Remove Color Noise. Great, and then we are going to set our blend mode to Color.

I am going to go ahead and change the blend mode to Color here from the pop-up list and then we'll go to Filter > Blur > Gaussian Blur. The trick here is to only blur it as much as really necessary. I'm going to take it all way back to the smallest number and you can see that there is still some noise there and we are just going to go ahead and crank up that slider and little increments until we don't notice the random red, green, and blue pixels anymore. Each image is going to use a slightly different value depending on the resolution and level the detail there but it looks like, about 4 pixels here that works for this particular image. I can hold down the Spacebar when I put my mouse outside of the dialog and pane around to kind of check at other areas, and yeah, that's looking pretty good.

So here is before, I'll turn the Preview check box off, there is before and there is after, maybe I'll zoom up one more time so you can see it better, Command+Plus, Ctrl+Plus, hold down space to zoom or pane around. Here is the Preview check box. We'll turn that off. There you can see the pattern pretty distinctly here. We'll turn Preview back on and you can see, we've pretty much eliminated the random red, green, and blue pixels. Now you still do see some luminance noise. That's that little green pattern there. We are going to go ahead and keep that. That's all right. We are just trying to get rid of the random colors that are kind of poisoning our image so to speak.

Great, I'm pretty happy with that, click OK. Let's fit to Window+Command+0 and there you have it. So pretty easy technique to remove Color Noise. Just dupe the layer, set it's blend mode to Color and then just blur it until that noise pattern disappears.

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This video is part of

Image for Photoshop Blend Mode Magic
Photoshop Blend Mode Magic

46 video lessons · 25570 viewers

Michael Ninness
Author

 
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  1. 2m 25s
    1. Welcome
      1m 33s
    2. Using the exercise files
      52s
  2. 13m 9s
    1. The three kinds of blending in Photoshop
      1m 49s
    2. Blend modes, blend modes, everywhere!
      1m 38s
    3. Cycling through the blending modes
      2m 1s
    4. Three blending modes you must know
      5m 8s
    5. Blending mode keyboard shortcuts
      2m 33s
  3. 3m 13s
    1. Roughening or pointilizing edges with Dissolve
      3m 13s
  4. 34m 40s
    1. Removing halos with Darken
      2m 26s
    2. Bringing down hot highlights with Multiply
      3m 50s
    3. Tonal correction with Screen and Multiply
      3m 35s
    4. Combining adjustment layers with blending modes
      3m 58s
    5. Creating a composite from a single Camera Raw file
      5m 56s
    6. Creating a cast shadow with Multiply
      4m 50s
    7. Creating artistic edges with Multiply and Screen
      3m 39s
    8. From iPhone to Photoshop: Colorizing line art with Multiply
      6m 26s
  5. 14m 47s
    1. Removing dust spots with Lighten
      1m 36s
    2. Adding lightning to a sky with Screen
      3m 20s
    3. Adding a lens flare effect with Screen
      2m 27s
    4. Reducing halos when sharpening with Lighten
      3m 55s
    5. Creating a faint soft-edged line drawing with Linear Dodge
      3m 29s
  6. 1h 5m
    1. Using Dodge and Burn with Overlay
      4m 34s
    2. Reducing wrinkles with Overlay
      6m 37s
    3. Using graduated neutral density filters with Overlay
      5m 32s
    4. Custom vignettes with Overlay
      3m 30s
    5. High-Pass sharpening with Overlay
      4m 16s
    6. Smoothing skin with High-Pass sharpening and Overlay
      5m 29s
    7. Textured patterns with Overlay
      6m 21s
    8. Textured type with Overlay
      2m 55s
    9. Creating a dramatic diffused glow with Overlay
      2m 49s
    10. Creating a subtle glow with Soft Light
      2m 57s
    11. Creating a medium glow with Soft Light
      4m 25s
    12. Simulating film grain with Add Noise and Soft Light
      3m 54s
    13. Recovering detail in over-saturated areas with Pin Light
      8m 30s
    14. Creating 80's pop art with Hard Mix and Multiply
      3m 15s
  7. 5m 7s
    1. Aligning layers with Difference
      5m 7s
  8. 12m 51s
    1. Reducing color noise with Color
      2m 13s
    2. Avoiding false saturation with Luminosity
      5m 33s
    3. Recovering detail in blown-out highlights with Luminosity
      5m 5s
  9. 26m 27s
    1. Getting better sepia tones
      5m 15s
    2. Using antique color effects
      5m 5s
    3. Combining multiple exposures
      4m 34s
    4. Replacing the sky in an image
      3m 44s
    5. Splitting edges when sharpening
      3m 15s
    6. Displacing type around contours
      4m 34s
  10. 22s
    1. Goodbye
      22s

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