What is the best software cure for CA

Started Aug 4, 2013 | Discussions thread
Anders W
Forum ProPosts: 19,066Gear list
Like?
Re: The REAL cure:
In reply to LaMesa, Aug 5, 2013

LaMesa wrote:

The typical characteristic of Chromatic Abberation is a radial magnification error of the green image content relative to the other colors, beginning from the center with a factor of 0.99 to 1.01.

The Radial Shift option of the free Photoshop plugin "Panorama Tools" can reverse and extinguish the error. I know of no better solution.

Once you have experimentally identified the correct value for your lens and focal length, the correction value can be stored and reloaded.

For the same lens and focal length the CA correction can be executed as a batch job. CA correction MUST be the first step of image processing. The procedure can be found here:

http://www.pbase.com/herbrd/olysp550

-- hide signature --

What you describe here is lateral CA only. There is also longitudinal CA (the primary colors not being in focus simultaneously rather than forming subimages of different size). Unfortunately, the longitudinal variety cannot be corrected as well or as easily as the lateral. Furthermore, it affects not only the in-focus area but also out-of-focus areas (color fringes on the blur discs).

You say you know of no better alternative than the one you describe. But from version 4.x, LR can correct lateral CA automatically, without any add-ons or profiles. You just have to check the box labeled "Remove Chromatic Aberration" (which, if you want, can be done by default via a preset when you import your files). From version 4.1, LR also has a defringe tool that allows you to deal with longitudinal CA about as easily and effectively as is currently possible.

 Anders W's gear list:Anders W's gear list
Panasonic Lumix DMC-G1 Olympus OM-D E-M5 Olympus E-M1 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Vario 7-14mm F4 ASPH +21 more
Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow