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Straightening your image

From: Photoshop CS4: Color Correction

Video: Straightening your image

Okay, now that we have covered the Dimensional Resolution, Linear Resolution, Interpolation, and then saving out in proper file format, either TIFF or .PSD. If we are going to be working on the file more, let's address that whole issue of straightening up your horizons. So let's go ahead and open up this Homer Beach image, which is a nice composition but boy, that horizon line, in this case it's the water/land horizon. Because the top of the land/air horizon is not as obviously off, because the topography itself is so irregular. But clearly the water land horizon is off.

Straightening your image

Okay, now that we have covered the Dimensional Resolution, Linear Resolution, Interpolation, and then saving out in proper file format, either TIFF or .PSD. If we are going to be working on the file more, let's address that whole issue of straightening up your horizons. So let's go ahead and open up this Homer Beach image, which is a nice composition but boy, that horizon line, in this case it's the water/land horizon. Because the top of the land/air horizon is not as obviously off, because the topography itself is so irregular. But clearly the water land horizon is off.

So once again as always, we'll make a duplicate copy, and in this case we'll just call this the Rotated Version. Rotating on a horizon is easy. In Photoshop CS4 there is actually a Rotation tool. Just go R for Rotate and then you can nondestructively rotate your image to say hey, what does that look like? But you can actually take a look at how you want your horizon to go and you can watch your rotation angle right up here as well. The other thing you can do is get the little scrubby tools, that you can just rotate it like this, if you prefer to do it that way, and then you can just reset the view so it goes back to the original.

To make your correction what we are going to do is actually go to our Info tool, and we are going to go to the Ruler portion of this Info tool. Remember, when there are multiple tools here, you can just keep toggling on the Eye tool until you get to the tool that you want, in this case the Ruler tool. This really is simple. You just click on one end of the horizon, and while you hold, don't click and then let go, just click and drag and just move down to the other side, and you will notice up top here, just watch the angle number right there. Just be careful, don't over do it here. Notice it's about -1.8?, and then release.

Then before you do anything else, come up on the image, and go underneath Image Rotation and choose Arbitrary, and a more accurate version, 1.77, what it actually was, will come up and then you just click OK. Now, notice when you do this, pixels are added in various places, because in Photoshop you can only work with Square Dimensional Images, or Rectangular Dimensional Images. So now you have to move to your Crop tool, C, and you have to pull this down here, make sure that you don't get any of the outside white pixels, or you have to do this again, and then click Enter.

Once you have accomplished that, then you can see that your horizon is nice and straight. If you need to go back to the original image at any point, you can, because you have done this on a copy of the image. So it works just like a champion, it's really easily done. Let's just do another one quickly just to show you how fast it can go. You just take your Eyedropper tool, drag this along the horizon, come underneath the image. If you have to do this very much, of course you can just assign a keyboard shortcut to that Image Rotation and then Arbitrary, and then just go right to the Crop tool. C for the Crop tool, this is where being able to swap tools quickly and easily really comes in handy.

Then just hit Enter, therefore your horizon line is nice and straight. All right, so that's it. That's rotating images using the freehand rotation, just so you can preview, and then the Info tool, the Rotation tool to help you get a good accurate rotation.

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This video is part of

Image for Photoshop CS4: Color Correction
Photoshop CS4: Color Correction

72 video lessons · 18107 viewers

Taz Tally
Author

 
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  1. 1m 40s
    1. Welcome
      50s
    2. Using the exercise files
      50s
  2. 58m 30s
    1. Setting color workflow preferences
      6m 39s
    2. Managing your memory for optimization
      6m 39s
    3. Assigning color settings
      5m 57s
    4. Understanding color tools
      8m 3s
    5. Accessing color correction tools with the keyboard
      6m 33s
    6. Customizing the color workspace
      6m 21s
    7. Mastering rules of engagement and keyboard shortcuts
      6m 2s
    8. Navigating around images
      7m 43s
    9. Saving time with keyboard shortcuts
      4m 33s
  3. 28m 44s
    1. Understanding the Bridge interface
      6m 19s
    2. Using batch rename
      3m 46s
    3. Adding copyrights and other metadata
      4m 40s
    4. Adding shortcuts to Bridge favorites
      2m 27s
    5. Customizing Bridge preferences
      3m 37s
    6. Navigating files and accessing metadata
      4m 1s
    7. Sorting and labeling images
      3m 54s
  4. 1h 8m
    1. Understanding pixel brick building blocks
      6m 43s
    2. No such thing as color
      5m 2s
    3. Building block channels
      3m 24s
    4. Understanding bit depth and grayscale
      9m 30s
    5. Understanding bit depth and color
      6m 47s
    6. Measuring RGB
      7m 29s
    7. Measuring CMYK
      6m 10s
    8. Exploring LAB
      2m 14s
    9. RGB vs. CMYK corrections
      5m 26s
    10. Understanding the Histogram's display of color
      7m 10s
    11. Understanding neutralization
      8m 54s
  5. 36m 25s
    1. Making visual evaluations and judgments
      10m 1s
    2. Understanding histograms
      7m 23s
    3. Going into details with histograms
      4m 47s
    4. Using numeric evaluation for highlights and neutrals
      7m 35s
    5. Using numeric evaluation for skin tones and complex images
      6m 39s
  6. 21m 35s
    1. Adjusting dimensions, resolution, and modes
      9m 22s
    2. Straightening your image
      3m 4s
    3. Cropping your image
      3m 40s
    4. Finding and evaluating patterns: noise, posterization, and screens
      5m 29s
  7. 48m 57s
    1. Using master channel histograms
      7m 18s
    2. Using individual channel histograms
      5m 9s
    3. Highlights with info and color sampler
      7m 16s
    4. Identifying and correcting shadows
      3m 53s
    5. Finding and using neutrals
      8m 42s
    6. Evaluating and correcting skin tones
      9m 1s
    7. Controlling brightness, contrast, and saturation
      7m 38s
  8. 33m 19s
    1. Presetting white balance
      1m 11s
    2. Customizing white balance
      3m 45s
    3. Target-based correction
      4m 23s
    4. Sharpening in RGB
      12m 37s
    5. Sharpening in LAB
      5m 4s
    6. Understanding white balance
      6m 19s
  9. 13m 28s
    1. Working through color correction
      13m 28s
  10. 20m 15s
    1. Introducing target-based corrections
      3m 1s
    2. Applying two-step target-based corrections
      5m 46s
    3. Applying multi-step target-based corrections
      7m 50s
    4. Saving Curves settings
      3m 38s
  11. 1h 26m
    1. Adding keyboard shortcuts
      2m 38s
    2. Histogram correction
      3m 51s
    3. Channel adjustments
      3m 18s
    4. Skin tones: Black-and-white clipping points
      4m 23s
    5. Skin tones: Cast shadows
      4m 19s
    6. Skin tones: Babies
      4m 45s
    7. Neutrals and potential neutrals
      4m 54s
    8. Clouds, snow, ice, and land
      7m 38s
    9. Flat images
      9m 10s
    10. Underwater images
      4m 23s
    11. Sacrifices
      8m 43s
    12. Image within image: Snow and sky
      9m 1s
    13. Image within image: Sunrise and mountains
      2m 54s
    14. Weird color casts
      5m 36s
    15. Review
      11m 8s
  12. 26s
    1. Goodbye
      26s

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