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Using the Despeckle filter

From: Photoshop CS3 Sharpening Images

Video: Using the Despeckle filter

Alright gang, in this exercise, I am going to show you the Despeckle filter and it is here under the Filter menu. You go to Noise submenu and it is this guy right there, Despeckle. And notice that it does not have a dot, dot, dot afterward. So it's not going to bring up a dialog box, it's not going to ask you to adjust any settings, it is just going to do its thing and move on. It is what I call a single shot filter. And the thing that it does is it looks for and locates single pixel variations inside of an image and it effectively eradicates them, it averages those single pixel variations away.

Using the Despeckle filter

Alright gang, in this exercise, I am going to show you the Despeckle filter and it is here under the Filter menu. You go to Noise submenu and it is this guy right there, Despeckle. And notice that it does not have a dot, dot, dot afterward. So it's not going to bring up a dialog box, it's not going to ask you to adjust any settings, it is just going to do its thing and move on. It is what I call a single shot filter. And the thing that it does is it looks for and locates single pixel variations inside of an image and it effectively eradicates them, it averages those single pixel variations away.

Now back in old days, you would see people demonstrate Despeckle as being useful for getting rid of say razor stubble, but that was back in the days when an average image measured 640x480. So something like razor stubble would actually only take up a single pixel inside an image. These days something as tiny as razor stubble will take up multiple pixels and so Despeckle is no good for it. What Despeckle is good for is removing digital noise, once again. And that's because digital noise comprises random single pixel variations.

So lets check it out, here I am working still inside the Sammy shake.jpg file, found inside you may recall the 03_Sharpen_ Filters folder even though we are in Chapter 4. And I am going to zoom way in on one of the details inside of this image. Lets take in the iris and with any luck you are going to be able to make out here inside the video, in addition to what looked like these sort of Japanese characters, these really cool, sort of hieroglyphics in his eyes here, which are made up of these motion trails basically, these highlight motion trails. You can hopefully see in the video barring severe compression artifacts, you should be able to make out that we have a lot of pixel roughness going on inside of the iris.

If we go up to the Filter menu and choose Noise and choose Despeckle, you are going to see a lot of those pixel variations go away and get averaged away. But notice right here, we are still ending up with some pretty jarring transitions right along the edge because these details, which are sensibly part of the eyelashes and so on, these details are made up of multiple pixels. So anytime you have got two or more pixels combining to make up the detail inside the image, Despeckle will bypass those variations. So let us just to get rid of single pixel variations. This is before, and you can see how a lot of these teeny-tiny ends of these hieroglyphic characters in his eyes how they are made up of single pixels. This is after they get blurred away.

Now what you typically want to do, if you are trying to get rid of digital noise in the file and usually I only whip out Despeckle if I have got some severe noise going, then you probably want to run the Despeckle filter more than once. You might want to run it twice, three times, even four times. What we are going to do inside of this image is we are going to run it four times in a row. So I already ran it one time, we can repeat the filter, you may know this, by pressing Ctrl+F or Command+F on the Mac for Filter, three times in a row. One, two, three and each time we are blurring away more and more of the single pixel variations and things are getting very blurry indeed wherever we had groups of pixels clustered together to make up the detail, then the Despeckle filter gave it the slip and allowed that detail to stand.

So lets go ahead and zoom out. That means the sharpest details, the most focused details inside the image remain intact and as we zoom out you are not going to see too much difference between the original Sammy and despeckled Sammy. For example, I am going to go up to the History palette here and this is the way - I'll go ahead and click on the Open state so we can see the original version of the image. It looks slightly sharper on-screen. Let me go and zoom the image into the 100% zoom size. So this is the original image, this is the four times, the 4X despeckled image.

So slightly different but not nearly as different as it would be if we were to apply the Median command with say a Radius value of 2. So its a very slight modifier, the Despeckle command is. Alright, so here is what I am going to do. I am going to go ahead and lets say we want to sharpen this image and I want to do a comparative sharpening. So I am going to show you something. Since we are working with the flat file here, this is a little trick I can do, I am going to press Ctrl+A, Ctrl+C in order to select the entire image and then copy it to the clipboard. That's Command+A, Command+C on the Mac and then I am going to go back to the original state of the image, the Open state, so that I have the despeckled state copied to the clipboard.

Notice that History did not keep track of the Copy command. It kept track at the fact that I did a Ctrl+A or Command+A to select the entire canvas but it did not keep track of copy. That means when I go back into the original Open state, I did not undo the copy, the copy is still sitting in the clipboard. So Photoshop behaves differently than other applications. If I were to pull that undo trick inside of a different program, it would undo the copying to the clipboard but Photoshop doesn't. So that's a cool thing actually because watch. I am going to go ahead for the sake of comparison, I want to show you the sharpened version and the original image compared to a sharpened version of the despeckled image.

So I am going to go up the Filter menu, choose Sharpen, this is the original image we are looking at, and choose Smart Sharpen and we'll just go with the same settings we have been applying. An Amount value of 200%, a Radius value of 4 pixels, and Lens Blur, Remove set to Lens Blur. Notice that More Accurate is turned off. I want you to know because I am going to turn it on in just a moment. So click OK. So that's a sharpened version of the original. Now then I am going to press Ctrl+V or Command+V on the Mac to paste the despeckled version on an independent layer. Notice that if I go to the Layers palette, there he is on an independent layer. Lets call him despeckled because that's what he is and he is not wearing spectacles either- so he is also despectacled.

Now I will go ahead and hide the Layers palette. Moving right along, of course, I will hide the Layers palette, press Ctrl+Alt+F or Command+Option+F in order to bring up the Smart Sharpen dialog box. I like the settings with one exception. Because I did so much despeckling, he is just coated in this protective layer, think of it that way, that will survive the application of More Accurate. So when I am sharpening on top of Despeckle, especially this many Despeckle's in a row, I will sometimes go ahead and apply More Accurate.

Even though I told you don't do that with portrait shots, well this is an exception. So I am going to go ahead and turn on More Accurate and notice now I am going to go ahead and click and hold- this is before and this is after. If I zoom in, click on it- this is before and this is after- notice we have these little tiny bumps. It's almost like those little bumps on a basketball. That's kind of what we have woven in to the fabric of the image right now and I'll click OK in order to accept that modification. Now I just want to show you the difference between a sharpened version of the original, which is this right here, this is the sharpened original.

Lets go and zoom in a little bit, so that we can see, actually the nose is one of my favorite parts of this image. Notice how painterly it looks. Once again, when we sharpen the original image and this is what it looks like when we have sharpened the despeckled version of the image. So we have little more rounding going on, a little more smoothing, also these interesting bumps that are being created by the interaction of Despeckle along with More Accurate and it gets even better, I am going to show you. Watch what happens if you press Ctrl+F or Command+F on the Mac to reapply Smart Sharpen with More Accurate turned on.

We are going to get this kind of halftone effect right here. Pretty nifty. If you are going for a special effect of course. This would not be just standard photographic print, but if you wanted to have this little bit pointilization actually then you could go with this effect right here and it's different. There is a Pointilize filter inside of Photoshop but this is a different effect that we are seeing right now. So anyway pretty interesting stuff I think. Now we have seen a lot of interesting ways to work with this image. I am going to just go ahead and undo that pointilization effect, so that we back to a more reasonable sharpening effect, where this image is concerned.

We've seen a lot of different ways to approach this image to get rid of some of the noise inside of the image. In the next exercise, I am going to show you how I would really approach this image. We have done so many different things to it. I will show you the best way to fix the focus problems that are associated with this image. Coming right up.

Show transcript

This video is part of

Image for Photoshop CS3 Sharpening Images
Photoshop CS3 Sharpening Images

115 video lessons · 17045 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  1. 50m 30s
    1. Why every image needs sharpening
      2m 38s
    2. Understanding the effects of sharpening
      5m 26s
    3. Understanding the mechanics of sharpening
      4m 19s
    4. Understanding sharpening and gradual transitions
      3m 21s
    5. Understanding sharpening and noise reduction
      4m 0s
    6. Understanding amount and radius
      7m 50s
    7. Measuring your screen resolution
      6m 19s
    8. Using reliable zoom ratios
      5m 30s
    9. Calculating the actual print size
      4m 54s
    10. Gauging the ideal sharpening settings
      6m 13s
  2. 59m 31s
    1. Everyone knows you sharpen last (and everyone is wrong)
      1m 8s
    2. Understanding the conventional sharpening workflow
      5m 4s
    3. Flattening and saving to TIFF
      6m 39s
    4. Downsampling (and why you shouldn't upsample)
      6m 8s
    5. Understanding last-step sharpening
      6m 44s
    6. Recognizing problems with the conventional workflow
      9m 38s
    7. Erasing sharpening with the history brush
      4m 30s
    8. Using alternative sharpening workflows
      2m 37s
    9. Sharpening a scanned photograph shot on film
      2m 45s
    10. Sharpening a digital photograph
      3m 6s
    11. Sharpening specific details
      3m 43s
    12. Finding broad workflow conclusions
      2m 49s
    13. Learning that technique trumps timing
      4m 40s
  3. 1h 27m
    1. Comparing and contrasting neighboring pixels
      1m 6s
    2. Using the Gaussian Blur filter
      4m 25s
    3. Using Gaussian luminance distribution
      4m 47s
    4. Using the Unsharp Mask filter
      4m 54s
    5. Understanding the history of Unsharp Mask
      3m 51s
    6. Building your own USM with Gaussian Blur
      7m 35s
    7. Using the Smart Sharpen filter
      7m 35s
    8. Compensating for camera shake
      8m 50s
    9. Building your own Smart Sharpen with Lens Blur
      6m 59s
    10. Using directional sharpening with Emboss
      9m 13s
    11. Using Smart Sharpen extras
      8m 56s
    12. Using Convolution Kernels for more accuracy
      7m 8s
    13. Using the High Pass filter
      7m 32s
    14. Using Luminance Sharpening
      5m 5s
  4. 2h 14m
    1. Smoothing filters, smart objects, and masks
      1m 25s
    2. Using the Median filter and Dust and Scratches
      7m 7s
    3. Using Smart Blur and Surface Blur
      6m 12s
    4. Using the Despeckle filter
      8m 17s
    5. Softening flesh tones selectively
      10m 15s
    6. Using the Reduce Noise filter
      7m 27s
    7. Combining smoothing and sharpening
      8m 24s
    8. Making an image into a smart object
      9m 24s
    9. Applying editable smart filters
      6m 8s
    10. Combining two smart filters
      8m 5s
    11. Assigning a filter mask
      5m 59s
    12. Nesting one smart object inside another
      10m 32s
    13. Employing a static High Pass layer
      8m 59s
    14. Matching static pixel-level edits
      4m 37s
    15. Avoiding clipping with luminance blending
      9m 7s
    16. Sharpening and smoothing
      6m 36s
    17. Making an edge mask
      8m 14s
    18. Making a non-edge mask
      7m 17s
  5. 1h 33m
    1. Sharpening with Adobe Camera Raw
      1m 29s
    2. Introducing Camera Raw (4.1 or later)
      8m 13s
    3. Understanding why to sharpen for source
      5m 14s
    4. Using Camera Raw’s sharpening control
      5m 52s
    5. Previewing limitations and tricks
      6m 45s
    6. Why downsampling doesn’t work
      3m 12s
    7. Reducing chromatic aberration
      7m 30s
    8. Using the Defringe option
      3m 32s
    9. Understanding high frequency, low radius
      5m 21s
    10. Raising the Detail value
      3m 6s
    11. Using on-the-fly edge masking
      5m 41s
    12. Sharpening a low-frequency portrait
      6m 36s
    13. Eliminating color noise
      4m 47s
    14. Reducing luminance noise
      4m 42s
    15. Correcting “false sharpening”
      7m 15s
    16. Reducing shadow noise
      5m 22s
    17. Approximating ACR sharpening in Photoshop
      8m 35s
  6. 59m 8s
    1. Gauging and exploiting luminance frequency
      1m 27s
    2. Using low-frequency source sharpening
      5m 53s
    3. Using High Pass for portraits
      4m 19s
    4. Actioning a low-frequency edge mask
      7m 42s
    5. Modifying the source sharpening
      5m 21s
    6. Using high-frequency source sharpening
      5m 26s
    7. Using Smart Sharpen for cityscapes
      3m 2s
    8. Actioning a high-frequency edge mask
      5m 4s
    9. Downplaying color artifacts and clipping
      4m 4s
    10. Sharpening a medium-frequency image
      5m 24s
    11. Sharpening a layered composition
      7m 16s
    12. Sharpening for multiple frequencies
      4m 10s
  7. 1h 8m
    1. Who needs dull when you have sharp?
      56s
    2. Focusing in on a person’s eyes
      4m 22s
    3. Blurring the area outside the eyes
      4m 22s
    4. Sharpening eyes and other details
      5m 38s
    5. Darkening the lashes and eyebrows
      7m 13s
    6. Sharpening dark-haired people
      5m 2s
    7. Edge mask and emphasize
      3m 39s
    8. Nesting a Smart Sharpen effect
      4m 48s
    9. Density mask sharpening
      5m 35s
    10. Adding depth of field
      4m 39s
    11. Sharpening a background
      4m 23s
    12. Masking background from foreground
      8m 51s
    13. Eliminating halos around a person
      5m 38s
    14. Deepening and warming a background
      3m 28s
  8. 1h 18m
    1. Reverting back to convention
      1m 37s
    2. Understanding the use-neutral composition
      4m 15s
    3. Restoring much-needed antialiasing
      4m 2s
    4. Reducing noise in a high-frequency image
      7m 24s
    5. Making a third-level smart object
      3m 55s
    6. Preparing an image for print
      5m 18s
    7. Using ideal settings for commercial reproduction
      5m 37s
    8. Calculating very large-format settings
      5m 11s
    9. Using ideal settings for inkjet output
      4m 26s
    10. Sharpening for commercial reproduction
      5m 45s
    11. Sharpening for inkjet output
      4m 58s
    12. Revealing high-frequency multipass sharpening
      5m 21s
    13. Using Gaussian Blur to sharpen hair
      5m 41s
    14. Flatten, Save As, Resample, and Sharpen
      5m 9s
    15. Revealing low-frequency multipass sharpening
      3m 30s
    16. Sharpening an image for web or screen
      6m 22s
  9. 1m 50s
    1. Goodbye
      1m 50s

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