- Why use Camera Raw?
- Opening photos into Camera Raw
- The Camera Raw tools A
- Cropping and straightening photos
- Choosing default workflow options
- Using the Camera Raw tabs
- Using the Basic tab
- Using the Tone Curve tab
- Using the Detail tab
- Using the HSL/Grayscale tab
- Using the Adjustment Brush tool
- Using the Split Toning tab
- Using the Lens Corrections tab
- Using the Effects tab
- Using the Graduated Filter tool
- Using the Radial Filter tool
- Using the Spot Removal tool
- Saving and applying Camera Raw settings
- Synchronizing Camera Raw settings
- Converting, opening, and saving Camera Raw files
This chapter is from the book
This chapter is from the book
This chapter is from the book
Using the Lens Corrections tab
Via the Lens Corrections tab in Camera Raw, you can correct a photo for various adverse effects of lens distortion. You can straighten out an architectural feature, such as a building or fence, that looks as if it’s leaning toward or away from the viewer, or that is tilted horizontally (isn’t level); and you can correct for under- or overexposure at the edges of a photo (vignetting). The corrections can be applied using a preset profile (this page) or manually (pages 81–83).
To correct geometric distortion and vignetting via Profile settings:
- Click the Lens Corrections tab.
Double-click the Hand tool 
to fit the image in the preview. - To access predefined lens profiles, click the Profile tab, then check Enable Lens Profile Corrections.
From the Setup menu,A do the following:
A Check Enable Lens Profile Corrections, then choose Auto from the Setup menu ...
Choose Auto to have Camera Raw read the EXIF metadata in the photo and attempt to select the proper lens make, model, and predefined profile.
If an error message indicates that the Auto option was unable to locate a profile, choose your lens manufacturer from the Make menu.B Camera Raw will locate a matching lens model and list it on the Model menu, and will locate a predefined profile and list it on the Profile menu. If the Model menu lists more than one model, choose the one with which the photo was shot.
B ... or choose your lens maker from the Make menu. Regardless of the Setup option, if necessary, adjust the Distortion value.
Under Correction Amount, do the following:
Set the Distortion value to control the amount of correction.
Set the Vignetting value to correct for under- or overexposure at the edges of the photo.
- Optional: If Camera Raw managed to locate your lens profile (step 3), you can save that profile and any custom Correction Amount settings as your new default profile by choosing Save New Lens Profile Defaults from the Setup menu. In future Camera Raw editing sessions, if you choose Default from the Setup menu, and the current photo was taken with this lens, the saved profile and settings will be applied. (To restore the Adobe predefined settings for your chosen lens, from the Setup menu, choose Reset Lens Profile Defaults.)
Optional: If you want to further correct any lens distortion manually, see the next task.
- When applying lens corrections to a Smart Object in Photoshop, we use the Lens Corrections tab in Camera Raw (accessed via Filter > Camera Raw Filter) because it has more extensive manual controls than the Lens Correction filter in Photoshop.
To correct geometric distortion or vignetting via the Manual tab:
Click the Lens Corrections tab,
and double-click the Hand tool to fit the image in the preview.A
A The original photo (above) shows signs of lens distortion: The house looks as if it’s tilting away from the camera, and it’s not level.
Click the Manual tab.B
B We clicked the Manual tab (under Lens Corrections) to access these menu options and sliders.
In the Upright area, click a button to apply a preset correction:
Auto
to apply level correction and fix horizontal and vertical convergence, balanced with as little distortion as possible.C
C Under Upright, we clicked the Auto button for a balanced correction. This partially corrected the vertical lines and vertical tilt, but the left side of the house still looks as if it’s farther away from the viewer than the right side.
Level
to apply only level correction (not fix horizontal or vertical convergence).Vertical
to apply level correction and fix vertical convergence (but not horizontal convergence).Full
for a stronger correction of horizontal and vertical convergence, in addition to level correction (A, next page).
A We clicked the Full button instead, which successfully made the house level and upright. To lighten the outer areas of the photo, we increased the Amount value (under Lens Vignetting).
If further manual correction is needed, do any of the following:
To spread the image out (fix pincushion distortion), lower the Distortion value; or to pinch the image inward (fix barrel distortion), increase the Distortion value.
- To display a grid over the image so you can check the alignment, check Show Grid or press V. Adjust the grid size via the slider.B
B We made some minor Vertical and Rotate adjustments, with Show Grid checked to help us gauge the effect.
To widen the top of the image, (correct keystoning) reduce the Vertical value; to widen the bottom of the image, increase the Vertical value. Readjust the Distortion value, if needed.
To widen the left edge of the image, reduce the Horizontal value; to widen the right edge of the image, increase the Horizontal value.
To rotate the image, change the Rotate value.
To enlarge or shrink the photo, change the Scale value. Note: You could crop the photo instead.
To stretch the image horizontally or vertically, change the Aspect value. This option is useful for correcting strong perspective distortion in photos taken with a wide-angle lens (A–B, next page).
A We tried increasing the Aspect value, but this setting exaggerated and distorted the verticals of the house too much.
B Instead, we set the Aspect value to –5, which exaggerated the horizontal proportion only slightly. The final settings we chose for the image are shown at right.
- If you moved the Distortion slider, you can click Reanalyze (below the buttons) to force a recalculation of the Upright correction based on the Distortion value. If you want to turn off (but preserve) all your Upright corrections, click the Off button.
If you click a different Upright button, as an alert will inform you, all the Transform sliders (except Distortion) will be reset to 0.
- To correct or apply Lens Vignetting (lighten or darken the outer areas of the photo), set the Amount value for the strength of the correction, then set the Midpoint value to expand the vignette inward or outward. Readjust the Amount value, if needed.
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