Archived posting to the Leica Users Group, 2010/08/28

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Subject: [Leica] IMG: Eliminating Chroma
From: benedenia at gmail.com (Marty Deveney)
Date: Sat, 28 Aug 2010 11:25:33 -0700
References: <CEDFD8C110F74328A0904A10CB8CB1AD@jimnichols> <AANLkTi=j2zYChTCFbNEA_0ZMa2hVDmEkzudFecQyO3gE@mail.gmail.com>

Tina, did you try Picture Window and other software that fix CA?  I
found it worked well.

Marty

On Sat, Aug 28, 2010 at 11:18 AM, Tina Manley <images at comporium.net> 
wrote:
> Jim -
>
> My Canon wide lenses show awful chromatic aberrations. ?I hardly ever see
> them with Leica lenses. ?That's one reason I was so glad to get back to
> Leica. ?I still have to go back fix the CA every time I want to use a photo
> made with the Canon wides. ?This is what Alamy says about CA:
>
> "Chromatic aberration or ?coloured fringing? is shown as magenta/green or
> red/cyan fringing in areas of an image that have greater contrast. Poor
> quality optics and extreme wide-angle lenses tend to show Chromatic
> Aberration especially towards the edge of the frame. To remove this you can
> use the Chromatic Sliders in the Lens Correction Tool in Photoshop, most 
> RAW
> conversion software has a similar tool. "
>
> They used to suggest an action that I use on the Canon photos using 
> Guassian
> Blur (12 or higher) > Edit > Fade/Color and the history brush to brush out
> CA. ?I've never been able to get rid of it using the Chromatic Sliders.
>
> Unless you're trying to get photos past quality control for a stock agency,
> I wouldn't worry about it.
>
> Tina
>
> On Sat, Aug 28, 2010 at 2:03 PM, Jim Nichols <jhnichols at 
> lighttube.net>wrote:
>
>> George,
>>
>> I decided to try the 35 Macro on the E-1, which causes me to change two
>> variables. ?First, no flash is involved. Second, the E-1 uses a Kodak
>> sensor. ?I see no signs of the chroma problem in this example, or others
>> that I examined.
>>
>> I now suspect that the fill flash, on the top of the camera, could
>> contribute to the top edge problem. ?But it sure allows me to get insect
>> images that I cannot get without it. :~((
>>
>> http://gallery.leica-users.org/v/OldNick/Rose+of+Sharon.jpg.html
>>
>> Comments and critiques welcomed.
>>
>> Jim Nichols
>> Tullahoma, TN USA
>>
>> _______________________________________________
>> Leica Users Group.
>> See http://leica-users.org/mailman/listinfo/lug for more information
>>
>>
>
>
> --
> Tina Manley, ASMP
> www.tinamanley.com
>
> _______________________________________________
> Leica Users Group.
> See http://leica-users.org/mailman/listinfo/lug for more information
>


In reply to: Message from jhnichols at lighttube.net (Jim Nichols) ([Leica] IMG: Eliminating Chroma)
Message from images at comporium.net (Tina Manley) ([Leica] IMG: Eliminating Chroma)