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Photoshop CS6 One-on-One: Advanced

Correcting for lens distortion


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Photoshop CS6 One-on-One: Advanced

with Deke McClelland

Video: Correcting for lens distortion

Over the course of this project we're going to take this portrait shot, which has some great composition in my opinion, but is a little bit flat in terms of the contouring, so in another words, his face is lit from straight on and ends up washing out a little bit. And we're going to give it some more volume; we're going to give it some more depth in order to come up with this final effect here. I should say this image once again hails from the Fotolia Image Library, about which you can learn more and get discounts by the way at fotolia.com/deke. Now the first thing we need to do is correct for the Lens Distortion that's associated with this image.
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  1. 30m 4s
    1. Welcome to One-on-One
      2m 19s
    2. Loading the dekeKeys keyboard shortcuts
      6m 5s
    3. Remapping your Macintosh OS shortcuts
      3m 4s
    4. Adjusting a few general preferences
      4m 3s
    5. Using the visual HUD color picker
      2m 2s
    6. The interface and performance settings
      5m 31s
    7. Adjusting the color settings in Photoshop
      7m 0s
  2. 47m 0s
    1. Smart Objects
      1m 36s
    2. Three ways to place a Smart Object
      3m 6s
    3. Copying and pasting from Adobe Illustrator
      4m 11s
    4. Transforming and warping a vector object
      4m 48s
    5. Blending a Smart Object into a photograph
      3m 10s
    6. Blurring with a nested Smart Filter
      4m 57s
    7. Editing a Smart Object in Illustrator
      3m 20s
    8. Creating "true clones"
      3m 50s
    9. Duplicating a group of clones
      2m 53s
    10. Breaking the Smart Object link
      2m 53s
    11. Styling and blending Smart Objects
      2m 44s
    12. Editing originals; updating clones
      3m 41s
    13. Removing people from a scene with Median
      5m 51s
  3. 29m 59s
    1. Luminance meets sharpening
      1m 2s
    2. Correcting for lens distortion
      4m 39s
    3. Introducing Shadows/Highlights
      3m 54s
    4. Mitigating halos with Radius values
      4m 19s
    5. Enhancing the effects of Midtone Contrast
      3m 18s
    6. Creating a "bounce" with Gaussian Blur
      3m 29s
    7. Sharpening on top of blur
      2m 47s
    8. Masking a group of Smart Filters
      2m 53s
    9. Reducing the density of a layer mask
      3m 38s
  4. 49m 10s
    1. Using Curves
      2m 40s
    2. Introducing the Curves adjustment
      7m 36s
    3. Adding and editing points on a curve
      6m 27s
    4. Winning Curves tips and tricks
      8m 12s
    5. Correcting a challenging image
      6m 33s
    6. Selecting and darkening highlights
      4m 39s
    7. Neutralizing colors and smoothing transitions
      6m 6s
    8. The new automatic Curves function
      6m 57s
  5. 1h 31m
    1. Camera Raw
      2m 11s
    2. Opening and editing multiple images
      8m 1s
    3. Correcting white balance
      4m 8s
    4. The revamped Exposure controls
      8m 8s
    5. Working with archival images
      7m 54s
    6. The Spot Removal and Graduated Filter tools
      6m 4s
    7. Painting edits with the Adjustment Brush
      7m 23s
    8. Tone Curves (and why you don't need them)
      5m 57s
    9. Straighten, crop, and geometric distortions
      5m 17s
    10. Applying manual lens corrections
      5m 14s
    11. Vignette, chromatic aberration, and fringe
      6m 49s
    12. Selective hue, saturation, and luminance
      6m 36s
    13. Working with JPEG and TIFF images
      6m 36s
    14. Camera Raw Smart Objects
      6m 48s
    15. Editing Camera Raw images from Bridge
      4m 24s
  6. 32m 30s
    1. Duotones
      1m 23s
    2. Creating a professional-quality sepia tone
      4m 18s
    3. Introducing the Gradient Map adjustment
      5m 42s
    4. Loading a library of custom gradients
      3m 48s
    5. Creating a custom quadtone
      5m 48s
    6. Colorizing with blend modes and Opacity
      4m 6s
    7. Creating a faux-color, high-key effect
      7m 25s
  7. 1h 6m
    1. Noise vs. Details
      1m 28s
    2. Introducing the Reduce Noise filter
      7m 29s
    3. Correcting a noisy photo
      5m 33s
    4. Smoothing over high-contrast noise
      5m 50s
    5. Protecting details with an edge mask
      4m 52s
    6. Adjusting overly saturated shadows
      3m 35s
    7. Correcting with High Pass and Lens Blur
      3m 45s
    8. Brushing away blur and sharpening
      6m 42s
    9. Creating texture by adding noise
      5m 28s
    10. The Camera Raw Detail panel
      7m 8s
    11. Correcting noise and detail in Camera Raw
      8m 10s
    12. Adding noise grain and vignetting effects
      6m 47s
  8. 44m 30s
    1. Blur Gallery
      1m 36s
    2. Creating depth-of-field effects in post
      5m 29s
    3. Modifying your Field Blur settings
      4m 57s
    4. Editing and exporting a Field Blur mask
      6m 15s
    5. Adding a synthetic light bokeh
      3m 52s
    6. Using the Selection Bleed option
      7m 29s
    7. Creating a radial blur with Iris Blur
      6m 59s
    8. Creating "fake miniatures" with Tilt-Shift
      4m 35s
    9. Combining multiple Blur Gallery effects
      3m 18s
  9. 1h 34m
    1. Blend Modes
      1m 16s
    2. Using the Dissolve mode
      9m 47s
    3. Multiply and the darken modes
      8m 30s
    4. Screen and the lighten modes
      8m 10s
    5. Cleaning up and integrating a bad photo
      6m 38s
    6. Blending inside blend modes
      6m 55s
    7. Overlay and the contrast modes
      6m 53s
    8. A few great uses for the contrast modes
      9m 7s
    9. Difference, Exclusion, Subtract, and Divide
      5m 5s
    10. Capturing the differences between images
      4m 18s
    11. Hue, Saturation, Color, and Luminosity
      4m 45s
    12. Blend mode shortcuts
      6m 21s
    13. The Fill Opacity Eight
      8m 57s
    14. Using the luminance-exclusion slider bars
      8m 8s
  10. 44m 20s
    1. Color Range
      1m 14s
    2. Introducing the Color Range command
      7m 24s
    3. Selecting a complex image with Color Range
      5m 49s
    4. Refining a selection in the Quick Mask mode
      7m 4s
    5. Viewing a mask with or without its image
      4m 24s
    6. Painting directly inside an alpha channel
      5m 39s
    7. Correcting fringes around a masked layer
      8m 5s
    8. Turning a layer into a knockout
      4m 41s
  11. 59m 43s
    1. Refine Edges
      1m 28s
    2. Laying down a base layer mask
      6m 49s
    3. Introducing the Refine Edge/Mask command
      7m 57s
    4. Edge detection and Smart Radius
      4m 42s
    5. Using the Refine Radius tool
      7m 31s
    6. The transformative power of Refine Edge
      3m 37s
    7. Perfecting a mask with overlay painting
      10m 58s
    8. Combining Quick Selection with Refine Mask
      10m 37s
    9. Bolstering and integrating hair
      6m 4s
  12. 1h 18m
    1. The Pen tool
      1m 50s
    2. Pixel-based masking versus the Pen tool
      6m 45s
    3. Drawing a straight-sided path outline
      6m 57s
    4. Moving, deleting, and adding anchor points
      6m 10s
    5. Dragging control handles to modify curves
      5m 27s
    6. Converting a path outline to a vector mask
      5m 36s
    7. Customizing a geometric shape
      5m 53s
    8. How to position points and control handles
      7m 7s
    9. Drawing smooth points with the Pen tool
      8m 7s
    10. Duplicating and scaling a vector mask
      5m 21s
    11. Cusp points and the Rubber Band option
      6m 21s
    12. Setting anchor points in the pasteboard
      6m 8s
    13. Using the Convert Point tool
      6m 43s

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Photoshop CS6 One-on-One: Advanced
11h 8m Advanced Sep 12, 2012

Viewers: in countries Watching now:

The third part of the popular and comprehensive series Photoshop CS6 One-on-One follows industry pro Deke McClelland as he plunges into the inner workings of Adobe Photoshop. He shows how to adjust your color, interface, and performance settings to get the best out of your images and the most out of Photoshop, and explores the power of Smart Objects, Shadows/Highlights, and Curves for making subtle, nondestructive adjustments. The course dives into Camera Raw to experiment with the editing toolset there, and returns to Photoshop to discuss toning, blur, and blend modes. Deke also teaches tried-and-true methods for sharpening details and reducing noise, as well as creating quick and accurate selections with Quick Mask, Color Range, and Refine Edge commands.

Topics include:
  • Adjusting the color settings in Photoshop
  • Placing and blending Smart Objects in a scene
  • Transforming and warping vector objects
  • Correcting for lens distortion
  • Mitigating halos and enhancing contrast with Shadows/Highlights
  • Adding and editing points on a curve
  • Editing multiple images in Camera Raw
  • Creating a pro-quality sepia tone or quadtone
  • Colorizing with blend modes and opacity
  • Reducing and smoothing over noise
  • Creating depth-of-field effects with blur
  • Selecting with Color Range and Quick Mask
  • Perfecting a mask with Refine Edge
  • Drawing paths with the Pen tool
  • Converting path outlines to vector masks
Subjects:
Design Raw Processing
Software:
Photoshop Camera Raw
Author:
Deke McClelland

Correcting for lens distortion

Over the course of this project we're going to take this portrait shot, which has some great composition in my opinion, but is a little bit flat in terms of the contouring, so in another words, his face is lit from straight on and ends up washing out a little bit. And we're going to give it some more volume; we're going to give it some more depth in order to come up with this final effect here. I should say this image once again hails from the Fotolia Image Library, about which you can learn more and get discounts by the way at fotolia.com/deke. Now the first thing we need to do is correct for the Lens Distortion that's associated with this image.

Notice if I switch back to the original, not only is the image crooked so it's leaning down into the right, but his head is leaning in the opposite direction, almost as if it is skewed, which means once we straighten the image, he's going to look more crooked than ever. Also, notice that the right half of his face, his left, appears narrower than the left half of the face, and presumably a lot of that has to do with Lens Distortion. The idea is that there's curvature associated with the lens element and as the light enters that element and then lights on to the image sensor, the light actually distorts on its way into the image and usually that distortion is found around the outside edge.

Fortunately, we can correct for Lens Distortion using a filter known as Lens Correction. We want to apply that filter as a Smart Filter of course, so I'm going to convert this image into a Smart Object by double-clicking on the background here inside the Layers panel and I'm just going to Name this layer dude. And then I'll go up to the Layers panel flyout menu and choose Convert to Smart Object, or if you loaded DekeKeys, you can press Ctrl+, or Cmd+, on the Mac. Next, go up to the Filter menu and choose Lens Correction, which has a factory keyboard shortcut of Ctrl+Shift+R or Cmd+Shift+R on the Mac, and that's going to bring up this big huge screen-gobbling dialog box.

Now you probably want to start things off inside the Auto Correction tab, and notice down here in the bottom-left corner of the window, we can see the camera model, which is a Canon EOS 5D Mark II. We might also be able to see the lens model, although in this case we can't, so we'll have to make that up. But we can see the Focal Length, which is 40 mm. So let's go ahead and dial in what we know into the Search Criteria. The Camera Make is already set to Canon. I'll go ahead and select from Camera Model the 5D Mark II from the list. And by default Photoshop goes ahead and grabs a 28mm lens, which is good enough where this image is concerned.

Presumably a lens like that does work. Now I recommend you go ahead and turn on all the checkboxes. By default you may only have Geometric Distortion turned; on you definitely want that turned on of course, because that's the main thing that we're trying to correct where this image is concerned. We're going to learn more about Chromatic Aberration when we take a look at Camera RAW in the future chapter, but for now just know that it's a misregistration of color around the outer edges of the image. Just about every image has some form of Chromatic Aberration associated with it, so you might as well go ahead and turn that checkbox on.

And if your image has vignetting, that is presumably darkness around the outer edge created by the lens element itself casting a shadow, then go ahead and turn on the Vignette checkbox, and you'll see that it makes a slight difference where this image is concerned. All right, the next thing you want to do is switch over to Custom so that we can modify the Geometric Distortion by hand. If you drag this slider to the left in order to apply a negative value, then you're going to create a kind of bulging effect like we're seeing here. If you move the slider to the right that gives you a positive value and you create a pin-cushioning effect.

We do want a pin-cushioning effect, but not that much, so I'm going to start with a value of 0, and I'm going to press Shift+Up Arrow a few times in a row in order to increase that value in single digit increments. And by the time you get to a value of +10, somewhere in that range, things start looking good. You notice that the two halves of his head look a lot more proportional. Next, I'm going to drop down to this Angle value and we want to modify it as well, and what I suggest you do here is press Shift+Down Arrow in order to incrementally rotate that image down into the left; that is in a counterclockwise fashion.

And at about -0.8, you end up getting a straight horizon, and to confirm that you can turn on the Show Grid checkbox, so that you can see that grid there, which is going to show you an exactly horizontal line so that you can compare it to the horizon in the background. And that ends up creating a very nice effect, so I'll go ahead and click OK in order to correct that lens distortion. So just to give you a sense of what we were able to accomplish here, this is the before version of the image quite distorted by comparison, and this is the after version.

Thanks to the Lens Correction filter, here inside Photoshop.

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