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Possible C1 ability

teng1
Dear All,

I was hoping that C1 is able to correct Lens Chromatic Aberration in the next upgrade...

Any supporter out there...
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Comments

8 comments

Date Votes
  • Olivier111
    Hey,

    I don't know if Chromatic Aberration can be corrected with a post-processing software since the problem comes the lenses.

    Technically, the CA can be corrected (partially) using an achromat,

    The achromat is often used in microscope.

    So the better the lenses you use, the lesser the chance that you'll get aberration.

    Maybe I'm wrong

    Cheers
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  • teng1
    FYI, Photoshop CS2 can correct CA at the point of Opening the RAW file. Reply to this thread, so I can show you how to do it.
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  • jjlphoto
    If you are referring to color fringing that gets worse as you move out to the edges, this is known as Transverse Chromatic Aberration. It is typically from one of the channles misregistered on top of the other. You will not notice any transverse chromatic aberration in the center as the R, G, & B channels are all together, but as you move away from the image center, the offending channel gets worse and worse as that color of light ray is no longer hitting the film plane in the same place as the other two.

    http://www.vanwalree.com/optics/chromatic.html#fig1

    CA is easily controlled with the many post processing fixes out there. I prefer Lens Fix from Kekus. Lens Fix uses the PanoTools formula. Even if not doing any distortion correction, I can work the R, G, & B channels separately to solve CA.

    Many of these fixes have supplied lens tables for many of the popular lenses out there, and you can also build your own table.

    The CA fix in Adobe is a sort of okay fix, it does'nt alter the RGB shapes with the degree of control and precision that PanoTools does. Sort of a generic simple barrel/pincushion curve, where-as PanoTools can handle complex forms like wavy-line or gull-wing.

    And of course, done in post. A RAW step for this would be great.
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  • teng1
    John,

    Thank you very much for your advice, I've just purchased the plug-in which cost USD25.

    I'm sure everyone here is going to love the idea that C1 can handle this in the future.
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  • Olivier111
    Thanks for the info... I'm getting less and less stupid every day... 😊
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  • roberte
    Hi,

    It would be much better if the CA was corrected from the RAW data. DxO handles CA better than any Photoshop plugin.

    If Phase One supported DNG you could use DxO to correct CA, output to DNG then use Capture One. It already works for ACR.

    -- Robert.
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  • teng1
    [quote="roberte" wrote:
    Hi,

    It would be much better if the CA was corrected from the RAW data. DxO handles CA better than any Photoshop plugin.

    If Phase One supported DNG you could use DxO to correct CA, output to DNG then use Capture One. It already works for ACR.

    -- Robert.


    Robert, can you direct us the site to get DxO. I'm assuming that you've tried, and at this moment Phase One does not support DNG as you've quoted.

    Am I right? Thanks just to be sure.

    Also, can I know what is ACR?
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  • jjlphoto
    It would be much better if the CA was corrected from the RAW data. DxO handles CA better than any Photoshop plugin.


    The problem with DxO is that it only corrects CA on supported lenses. PanoTools /LensFix allows you to easily build your own correction table for any lens. The interpolation algorithms PanoTools uses are so precise, there is no noticeable loss in detail running it as a PS plug-in. (Technically, yes, there is alway data loss in PS edits, but I have not seen any noticeable loss with PanoTools.)


    Also, can I know what is ACR?


    ACR = Adobe Camera RAW. This is what processes the RAW files if you buy Adobe CSxx. Technically speaking, it is not Photoshop, but most folks refer to it as processing their RAW files in Photoshop. Just a semantics thing.
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