Eliminating Chromatic Aberration From Your Fujifilm® FinePix® E900, and E550 Pictures

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When you visit forums, or reviews about the Fuji FinePix® E900, [or E550 which is equipped with a lens of similar design], you may be disturbed to learn that the lens creates purple fringing, due to chromatic aberration.This really isn’t a problem unless you’re looking for one? Most camera lenses create aberration to some degree. Of course the most expensive lenses designed for professional use are built to resist aberration problems, but even these if pushed to perform in extreme conditions may still display some unwanted colour fringing.

Your eyes’ lenses exhibit chromatic aberration, but you suppress this by having a special pigment in the rear of the eyeball, and also possibly there are other neurological filters in the eye and brain that aren’t yet fully understood.

If one of your pictures is spoilt by colour fringing you simply emulate nature and remove the problem in post production.

Several variations of solution are possible. Here are my two preferred methods.

Using your jpg image editor.

To remove chromatic aberration using Adobe Photoshop®, Paintshop Pro®, ACDSee Pro®, simply follow this recipe.

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Sidebar

The examples below were cropped from
this image. The chromatic aberration was
created by using a cheap lens attachment.

Kindly note: When I decided to write about this topic I went to some length to find examples of purple fringing in my images. I could find very few good examples that couldn’t be attributable to other causes, such as reflections in cylindrical metal pipes. I then decided to shoot specific examples and tried pictures of trees against strong sunlight, which surely would display problems? No chromatic aberration could be detected in my pictures. I shot the same pictures with a Canon 20D fitted with a 18 – 55 USM lens. The results from the Canon lens were if anything slightly worse in terms of aberration, and definitely worse in terms of accurate colour for the sky than rendered by the E900.

In desperation I fitted the Fuji FinePix® E900 with a cheap generic 2x telephoto supplimentary lens, the kind you can purchase for a few dollars with an adapter at any general camera shop, or from EBay. I knew this would cause chromatic aberration because when I look through the lens without attaching a camera I can see it plainly. It was with this set-up that I photographed the examples used in this article. In other words: ‘There is chromatic aberration in the example ~ but it is neither due to Fuji, nor the FinePix® E900 lens’.

End Sidebar
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With the image magnified 200%
purple finging is evident..

1. Load your image into your preferred image edition software.

2. Select the magnification tool and select ‘Actual Pixels’. Left click the tool again to bring the image to double magnification. At this resolution you should easily be able to detect problems in areas where white subject matter meets a dark background, or vice versa.

3. Select the Magic Wand Tool with a sensitivity of about 80 and click of the coloured fringing to isolate it.


Select the coloured fringe with the magic wand
and then desaturate it as described here.

4. Go to Image – Adjustments – Saturation and pull the saturation toward Zero. The colour will fade in the areas you have selected, but you may be left with a fine line between the unaffected area and the area that you have just desaturated. This is removed by using the Healing Brush Tool, or by blending the area using the Blur Tool.

5. When you return the resolution to ‘Actual Pixels’ little, or none, of the original fringing will be visible.

Voila: No unwanted purple fringing!.

To remove chromatic aberration from Fujifilm FinePix® E900 RAW images

A RAW image consists of the information the camera sensor ‘sees’ before it is converted into a .jpg by the camera. Images taken in the RAW format must therefore be converted in your computer using RAW editing software.

A RAW image may be saved on the Fuji Finepix® E900 by going to the Camera Menu, selecting Settings – Page 2 – RAW and toggling the tab to ‘ON’

You cannot make adjustments to RAW images using the Finepix Viewer, which comes bundled with the Finepix® E900 digital camera. Instead I recommend you to use S7raw, which is a free utility developed for the Fuji Finepix® digital camera range. s7RAW provides a full range of editing options including exposure compensation.

Load the RAW file into S7raw,
select lens and click the auto chromatic aberration tab.

1. Download and install S7raw on your computer.

2. Load your RAW file.

3. Select the ‘Lens’ tab.

Note the purple fringing seems more pronounced
in unprocessed RAW images when
viewed through the magnification tool.

4. Check the ‘Chromatic Aberration Box’, and click ‘Auto’ ~ Your computer will then seem to go crazy as the program works its way through your image for several minutes. You can do nothing to speed things up, or to escape the delay – so put the kettle on and make a pot of tea. Eventually your image will be delivered ‘washed and clean’.

Quite a good job for an automated function!

4. Eliminate the fine purple line that remains by selecting the Colours Tab in S7Raw. Select ‘Red’ from the drop down menu ~ S7raw will remove the purple line which is the remains of the original fringe.

Change to the colours tab in S7raw and
select ‘Red’ from the drop down menu.
‘Bootiful!’

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