Any idea how to get rid of purple fringing using tools available in GNU/Linux?

Emacs · 06-02-2011, 08:43 AM

Click image to get the original copy.
Can someone advise me hot to get rid of this fringing?

gooberlx · 06-02-2011, 09:16 AM

Have you tried Darktable? IIRC, it uses rawtherapee's amaze demosaicing algorithm and might automatically get rid of fringing and/or chromatic aberration....assuming you shoot RAW.

edit: Looked at the exif and I see you did use darktable. That was my best suggestion.

Guest · 06-02-2011, 10:32 AM

Normal chromatic aberration corrections don't normally work on purple fringing--especially if you're using a manual lens for which there is no automatic correction (the function in darktable requires data from the lens AFAICT). I've achieved good results with the hue-saturation control in GIMP. Just lower the saturation of the magenta and blue channels--this works fine for many subjects. Here's a before and after crop of a shot taken through an SMC Takumar 50mm f1.4.

Emacs · 06-04-2011, 01:49 AM

Thank you, nevermindhim, this approach seem to be adequate enough.

06-02-2011, 08:43 AM	#1
Emacs Veteran Member Join Date: Oct 2010 Location: Moscow Posts: 1,223	Any idea how to get rid of purple fringing using tools available in GNU/Linux? Click image to get the original copy. Can someone advise me hot to get rid of this fringing?

06-02-2011, 10:32 AM	#3
Guest Guest	Normal chromatic aberration corrections don't normally work on purple fringing--especially if you're using a manual lens for which there is no automatic correction (the function in darktable requires data from the lens AFAICT). I've achieved good results with the hue-saturation control in GIMP. Just lower the saturation of the magenta and blue channels--this works fine for many subjects. Here's a before and after crop of a shot taken through an SMC Takumar 50mm f1.4. Attached Images

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06-02-2011, 09:16 AM	#2
gooberlx Junior Member Join Date: Dec 2009 Location: Colorado Posts: 49	Have you tried Darktable? IIRC, it uses rawtherapee's amaze demosaicing algorithm and might automatically get rid of fringing and/or chromatic aberration....assuming you shoot RAW. edit: Looked at the exif and I see you did use darktable. That was my best suggestion.

06-04-2011, 01:49 AM	#4
Emacs Veteran Member Join Date: Oct 2010 Location: Moscow Posts: 1,223 Original Poster	Thank you, nevermindhim, this approach seem to be adequate enough.

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