Adobe Camera RAW Video Tutorial - Lens Correction Tab
Posted by Wilk | Filed under Adobe Camera RAW tutes
The Lens Corrections tab allows you to do two things, remove fringing and/or add or remove
Lens Vignetting.
The Chromatic Aberration part of the dialog box is what removes fringing. Although absent from film photography, digital sensors combined with certain lenses and lighting conditions can introduce fringing (most commonly as purple fringe) in photos, photos taken backlit with certain conditions in the subject matter, and especially with "cheaper" lenses, though some very specific very expensive lenses have the problem to under certain conditions.
The Chromatic Aberration tool is actually pretty simple to use. The Defringe dropdown offers 3 settings; Off, Highlight Edges and All Edges. For the typical shot, highlight edges will be the flavor of choice, because highlight edges is where fringing most commonly occurs. I suggest as you use this tool you zoom in to 100% pixel view of an area where fringing is prevalent—the keyboard shortcut to do that is Alt+Ctrl+0 (zero) [Command+Options+0 on the Mac]—this shortcut works in both Adobe Camera Raw and Photoshop. Playing with different settings from the dropdown and the sliders, you’ll soon find a setting that works with a particular photo. As you use the tool more, you’ll find yourself making mental notes of which lens you were using, as fringing tends to be pretty predictable for a given lens on a given camera, especially in backlit photos (where fringing tends to occur).
The Lens Vignetting sliders will become apparent on how they work with just a couple minutes of experimentation. Vignetting occurs mostly with wide angle lenses, especially on full frame sensors. and is characterized by dark corners. Moving the slider to the right will lighten the corners, in most cases effectively reducing and most of the time eliminating the vignetting. The Midpoint slider allows you to move the Vingetting correction closer to the center of the photograph as you move it to the right, so that you can correct more severe Vignetting.
Conversely this is a way to INTRODUCE vignetting into a photo that has none for artistic purposes.
Tags: adobe camera raw, nondestructive, post processing, video tutorial
