Doug Aurand
Posts: 3282
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
|
Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 17:12 GMT
|
|
My next step in improving my image quality is to learn to fix Chromatic Aberrations
DennisS told me he adjusts the Saturation of the Aberrations color down and this does reduce the fringe but it also reduces the Saturation of that color throughout the image
Some body else suggested using Channels and realigning the color layers with each other. But I could never get my head around how to move the color Channels like Layers
The second method seems better because it doesn't remove color from the whole image to reduce it in the area of the Aberrations and it seems like it would Sharpen the edges because the color Channels would all be aligned.
Aren't Chormatic Aberrations basicly misaligned color Channels caused by a prizm effect?
The other thing I couldn't get figured out in my mind was on a lens like my Sigma 8mm, if I move a color Channel like a Layer to eliminate the fringe in one place won't I just create it in another place?
An on our fisheye lenses would it work better to increse of decrease the size of the color Channels. My question is whether the Aberration is Horizontal/Vertical or Radial on an 8mm.
Has anybody used DXO Optics Pro to correct CA?
Thanx
Doug Aurand
Albuquerque, NM
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 17:42 GMT
updated: 16 Apr 2010 at 17:43 GMT
|
|
Sorry Doug but I seen you have been talking about this for long time.
Do not say you do not have Photoshop.
Or still use JPG .
CA is fixed as a standard setting when you convert your RAW in Camera Raw.
Hans
|
|
alert moderator
|
|
Tim Eastman
Posts: 133
Location:
Registered: 13 Nov 2006
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 18:27 GMT
|
|
|
One nice benefit to going from a D80 to D300 is the in camera chromatic aberration reduction, which cuts down drastically. I assume Canon also does this at some level?
|
|
alert moderator
|
|
Clay
Posts: 251
Location: Port Colborne, Ontario, Canada
Registered: 23 Aug 2004
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 20:36 GMT
|
|
Hi Doug,
I'm doing most of my image correction in Adobe Lightroom. there are sliders for Chromatic Aberration in Red/Cyan, Blue/Yellow and there's a button for defringe.
Oh, and sliders for noise reduction in Luminance and Colour. Its all probably in Photoshop, but I find it very effective in Lightroom.
Here's an example shot on a p5100 with an FC-E8 lens...(Yuck)!
www.portcolbornecameraclub.com/members/clay/witch...
Of course, now I have my Samyang 8mm on my DSLR, its much less critical.
Regards,
Clay
|
|
alert moderator
|
|
iam360Texas
Posts: 298
Location: Fort Worth, Texas, United States
Registered: 12 Jul 2006
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 21:22 GMT
updated: 16 Apr 2010 at 21:24 GMT
|
|
Improvements to imaging on this URL
From what I saw.. CA is not the issue.
Need control over zoom in/out.
What software did you use to create this image ?? that would cause those big black triangles ??
Keep in mind we are trying to help you generate a great imaging !! Including the audio.
|
|
alert moderator
|
|
|
Guest
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 22:41 GMT
updated: 14 Mar 2011 at 16:13 GMT
|
|
iam360Texas said: What software did you use to create this image ??
SpinControl VR (Pano Salado) (as you can see in the upper right corner of the window... where it carries a link).
That was also my first/only guess before checking. If people are not careful with the settings, the panos can do more harm than good.
There is absolutely need to set a limit on the zoom to avoid the breaking up of the pano, and should be easy to do so in the xml.
|
|
|
|
Doug Aurand
Posts: 3282
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 22:51 GMT
|
|
Hans
I do have Photoshop CS2 and Adobe Camera RAW, but have not shot much in RAW
But I do have a ton of RAW images from the PhotoWebUSA lat year I can play with
When you say "CA is fixed as a standard setting when you convert your RAW in Camera Raw" do you mean the software will do it Automaticly or is it something I have to do.
Thanx
Doug Aurand
Albuquerque, NM
|
|
alert moderator
|
|
bigwade
Posts: 826
Location: Utrecht, Netherlands
Registered: 19 Oct 2005
|
Re: Fixing Chromatic Aberration
Posted: 16 Apr 2010 at 22:59 GMT
|
|
I'm not sure CS2 can do it but CS3 can.
Open your folder/images in Brigde, select images, open with camera raw and all tools are available, even for jpg images.
|
|
alert moderator
|
|
John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
|
Re: Fixing Chromatic Aberration
Posted: 17 Apr 2010 at 7:52 GMT
|
|
Doug Aurand said: When you say "CA is fixed as a standard setting when you convert your RAW in Camera Raw" do you mean the software will do it Automaticly or is it something I have to do.
CA correction is not done automatically. When you have opened your RAW image in ACR, click on the Lens Corrections icon in the right panel. You'll then see the two sliders for correcting the CA. Zoom in to a part of the image near a corner that has detail showing the CA effects. NB. Take care to distinguish between classic CA and the purple or red fringing that frequently occurs at the edges in very high contrast areas - such as tree branches set against an overexposed sky. The defringing option is available to reduce those.
Correct the CA by adjusting the position of the two sliders. Note that you can hold down the ALT key as you drag the slider to hide the blue/yellow fringes as you adjust the red/green slider, and vice versa. If you adjust the sliders to their maximum and minimum extents, you'll see the greatly exaggerated CA that you are trying to correct. Simply move the slider backwards and forwards to home in on the optimum position. Click on Done to save all the current conversion settings.
You can copy the settings from one image to a selected set of images in Bridge via the menu that's accessed with right click on the image(s). On later versions of CS, the "copy settings" option is on the Develop Settings sub menu. Alternatively, you can open a set of images in ACR, make the CA adjustments on one and then use the Synchronize button to apply the settings to all the other images.
John
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Fixing Chromatic Aberration
Posted: 17 Apr 2010 at 8:12 GMT
updated: 17 Apr 2010 at 8:20 GMT
|
|
I have an CS2 version still and I just checked.
The standard 2 sliders are available but not the special defringe option.
You save your settings in Camera Raw from the settings menu. You can then apply all your standard conversion settings by selecting it from the button.
You can also save this setting as your default if you want to have it automatically applied for your Sigma 8 when you open an image in Raw.
My settings for a Sigma 8mm 3.5 is -50 +25. In CS 4 you should also have the full defringe applied.
You can also adjust vignetting in the same menu. Even if the new Sigma has very little it may still be some left which you best see in PTGui editor.
Here is a test page I made a couple of years ago.
www.panoramas.dk/panorama/Sigma-8mm/color-aberrat...
I guess this was with CS2 or CS3. It does not look like I had the defringe option.
I never use Bridge. Especially back in CS2 it was pretty useless.
I open my images directly in Photoshop usually from my iView Media Pro and I usually just select all images in Camera Raw. Just checked that you can open multiple images also in CS2.
You can adjust all images in one go also without using the syncronization.
Hans
|
|
alert moderator
|
|
Hans Nyberg
Posts: 2791
Location: Denmark
Registered: 28 Aug 2005
|
Re: Fixing Chromatic Aberration
Posted: 17 Apr 2010 at 8:59 GMT
|
|
Sorry that was the settings for the old Sigma 8 F4. The Sigma 8 F3,5 should be more like -30 +30 at F8, I do not have one myself so this is just from 1 single image I have got from Bernd Dohrman.
I checked it in CS4 also and adding Defringe all edges almost removed the blue fringe but not as good as for the Sigma 8 F4.
Hans
|
|
alert moderator
|
|
John Houghton
Posts: 3487
Location: Hitchin, United Kingdom
Registered: 17 Jan 2005
|
Re: Fixing Chromatic Aberration
Posted: 17 Apr 2010 at 15:55 GMT
|
|
Although not of immediate interest to Doug, CS5 will have "automatic correction of lens distortions, chromatic aberration, and vignetting". I think I read somewhere that initially this would be for a selection of Nikon and Canon lenses.
John
|
|
alert moderator
|
|
panocanarias
Posts: 42
Location: Tenerife, Canary Islands, Spain
Registered: 22 Oct 2006
|
Re: Fixing Chromatic Aberration
Posted: 17 Apr 2010 at 17:28 GMT
|
|
John Houghton said: ... CS5 will have "automatic correction of lens distortions, chromatic aberration, and vignetting" ..
.. read somewhere .. this would be for a selection of Nikon and Canon lenses.
.. probably for Sigma lenses, too 
Found here: www.dpreview.com/news/1004/10041602sigmalesadobec...
Salu2, Klaus
|
|
alert moderator
|
|
Pierre Gielen
Posts: 115
Location: Netherlands
Registered: 23 Jan 2008
|
Re: Fixing Chromatic Aberration
Posted: 18 Apr 2010 at 22:01 GMT
|
|
|
Yes, I am using DXO and it does a good job at correcting lens relates issues like chromatic abberation. It does this by using lens and camera distortion databases.
|
|
alert moderator
|
|
Doug Aurand
Posts: 3282
Location: Albuquerque, NM, United States
Registered: 2 Jan 2008
|
Re: Fixing Chromatic Aberration
Posted: 19 Apr 2010 at 15:46 GMT
|
|
Pierre
Thanx for the feedback
I'm using a Sigma 8mm f/3.5 which DXO doesn't have a module for.
Have you tried manually correcting CA with DXO?
Doug Aurand
Albuquerque, NM
|
|
alert moderator
|
|
Prev
