New Feature: Playlist Center! Pick a topic and let our playlists guide the way.

Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Straighten, crop, and geometric distortions

From: Photoshop CS6 One-on-One: Advanced

Video: Straighten, crop, and geometric distortions

In this movie I'll show you how to straighten, crop, and correct for Geometric Distortions inside Camera Raw. Now Camera Raw's Straightening Crop tool is pretty straightforward, you'll figure them out quickly enough. But there are times where no matter how much you try to straighten an image, it still looks crooked, either because of Lens Distortion or because there's just enough perspective in the shot to mess it up. And this image is a case in point, San Simeon pool.dng is a famous swimming pool from the William Randolph Hearst's Estate.

Straighten, crop, and geometric distortions

In this movie I'll show you how to straighten, crop, and correct for Geometric Distortions inside Camera Raw. Now Camera Raw's Straightening Crop tool is pretty straightforward, you'll figure them out quickly enough. But there are times where no matter how much you try to straighten an image, it still looks crooked, either because of Lens Distortion or because there's just enough perspective in the shot to mess it up. And this image is a case in point, San Simeon pool.dng is a famous swimming pool from the William Randolph Hearst's Estate.

Appeared in all kinds of movies, I shot it at high noon, so there's a terrific amount of contrast. So the first thing I did was cool it down by establishing some basic settings here, and I went ahead and saved out those settings as a snapshot. You can access that snapshot from the Snapshots panel or you can click on the flyout menu icon, and then choose Apply Snapshot and then ACR7 conversion. And that will go ahead and temper the contrast and take some of the heat out of the shot. Now we want to straighten it and I'll do so using the Straighten tool. Now this is a pretty good tool. It's not as good as Photoshop's Straighten tool, frankly, because you just have one shot at it.

That is to say, you can't draw the line and then edit it. And it's not very obvious where the hotspot of the cursor is, it's actually in the lower-left corner. So I'll start at this location here and then drag to the right side of the base of these steps, and that ends up automatically creating a crop boundary, as well as switching you to the Crop tool. Now from this point on you can modify the crop boundaries, just as you can inside the Photoshop, but you're seeing the image crooked and the image remains crooked until you switch to a different tool.

Now if you want to change the Aspect Ratio of your crop boundary, you can click and hold on the Crop tool like so, and choose one of these items or you can dial in the Custom ratio as well. And you can also get to those very same controls by right-clicking inside of the crop boundary. And notice among these options is Show Overlay, and that'll go ahead and bring up those gridlines that represent the rule of thirds. And notice by the way as you adjust your crop boundary you can move it inward, but you can't move it out beyond the edge of the image.

So in other words, Camera Raw insists upon clipping some of the image away. Now assuming you like what you have, and I'm just fine with it, go ahead and press the Z key to switch back to your default Zoom tool and then the image will appear upright. Problem is it doesn't really appear upright in all portions of the image, so in other words this architectural item in the background looks just fine, but these lines in the foreground are not plumb, that is P-L-U-M-B, perpendicular, instead they're set at angles and that's because the shot has some perspective in it.

And that's where we need to correct for Geometric Distortion. And there are two ways to pull that off. One is automatically, and one is manually, so let me show you an automatic method for starters. I'll go ahead and switch over to this image New York.dng and this is a photograph that comes to us from Chris Orwig, a fellow trainer here at lynda.com. And notice that it does have some barrel distortion associated with it. So you can see this horizontal line up here at the top of the image bend upward in the center, whereas, it should be absolutely horizontal.

All right, let's start off by correcting the image. I'll click on the flyout menu icon, choose Apply Snapshot and then choose ACR7 conversion and we end up with this brighter version of the scene, and then I'll switch over a few panels to Lens Corrections, and by default you should see the Profile tab active. Go ahead and turn on Enable Lens Profile Corrections and that's all there is to it. Camera Raw immediately recognizes that this is a Canon EOS 5D and it also recognizes the lens as well, and so it corrects not only for the distortion inside of the image, but for the vignetting as well.

So if I turn off the Preview checkbox for a moment, you can see that the image bulges outward once again, so we've got some barrel distortion associated with the scene, and we've got some obvious dark vignetting around the perimeter. Whereas, if I turn that Preview checkbox back on, all of that goes away, we now have a straight horizontal line across the top of the image. It looks to match the angle of the top of the preview as well, so everything appears to be exactly as it should be. However, if it doesn't go far enough or it goes too far, then you can adjust the slider values here.

Right now they're both set to a correction amount of 100% apiece, but if you want less correction, then you would go ahead and dial this value down and that's going to bring back some of that barrel distortion. If you want more correction, then you can dial this value up and we're going to get some pin-cushioning going on here. So now the line is bending slightly downward. In the case of this image however, I found that 100% for both values work splendidly. The problem is Camera Raw doesn't know what to do with all images.

For example, if I switch back to San Simeon pool and I turn on Enable Lens Profile Corrections, even though it recognizes this image was shot with a Olympus E-30, it doesn't have the slightest idea what to do with this image, and in fact, if I go ahead and click on the Make setting here, Olympus is not even listed in the menu. What that means is I'm going to have to correct this image manually, which actually turns out to be a fair amount of fun, as we'll see in the next movie.

Show transcript

This video is part of

Image for Photoshop CS6 One-on-One: Advanced
Photoshop CS6 One-on-One: Advanced

124 video lessons · 18965 viewers

Deke McClelland
Author

 
Expand all | Collapse all
  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

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold

Are you sure you want to delete this note?

No

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.