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Old Jun 8, 2002, 10:00 AM   #1
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Default Purple Fringe on Olympus D40... should I switch to Powershot

I bought an Olympus D-40Z and I like it very much. Only one bug, something lot of purple fringe. For example took a picture in a church but the sunlight was coming thru the windows. I had so much purple that it shows up well even on a 4x6 printed copy.

Now my question, should I switch to a powershot S30/S40, or the purple fringing will most probably be there as well anyway?

Because beside that, I'd like to keep the D40z... pretty cool little-thing.

PS: Any suggestion to minimize purple fringe?
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Old Jun 8, 2002, 11:56 AM   #2
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The Olympus cameras (and Nikon) do seem at least a little more prone to purple fringing than the others e.g. Fuji, Minolta etc. Take a look at this site http://www.normankoren.com/

Most digicams suffer PF or Chromatic Aberrations to some extent or another. Not sure if the two alternatives you mention are any better though.

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Old Jun 11, 2002, 11:36 PM   #3
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Default You can always re-balance the color.

Canon makes great cameras but, it seems that they make better digital cameras than other brand in higher price range.
For the same price range, I almost always recomend Olympus over other brand, unless they want smaller and ligher cameras.
About your problem, try ACD See, Photoshop, or anyother graphic program to balance your photo files. There are many wonderful applications that are quite easy to use. It is always better to retouch your photo before printing.

[Edited on 6-12-2002 by hongwu]
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Old Jun 30, 2002, 2:44 PM   #4
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Chromatic problem came about with the 2 megapixel cams and above. Bright lighting behind the subject seems to bring out the unwanted purple.
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Old Jun 30, 2002, 4:34 PM   #5
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Default Some clues...

sunlight was coming thru the windows
There are two types of color fringe which are both commonly referred to as chromatic aberrations.

The first, which is true chromatic aberration, is caused by the light spectrum being differentially focused by the lenses. Light being broken into it's colors - as with a prism - is not focused on the same spot because of various lens problems. This is "usually," but not always, red/green color fringe, and is generally worse the longer the focal length. It's especially noticeable in the extreme periphery of the image and frequently when using telephoto adapters.

The second type of color fringe which is more properly called "blooming" is caused by electrical leakage between adjacent pixels and always found in areas of high contrast, such as where strong light and a dark object meet. Frequently it's found in pictures where sky and the subject intersect around leaves of trees or vegitation. Blooming is most common on consumer grade cameras and is rarely found in professional grade equipment. The reason is most likely the greater pixel density or close proximity of photo sites on the small but crowded sensors found in consumer digicams.

True chromatic aberration can be corrected by using a variety of software. My personal favorite is Picture Window Pro 3.1 which has a very easy to use slider bar for red/green and for blue fringe. You could also try an inexpensive product like QimagePro which has a "one click" filter that works very well in some cases. Picture Window Pro 3.1 sells for $89 and QimagePro for $35. Both products do much, much more than just remove chromatic aberration.

If the problem is blooming - and from your description (see quoted text) I believe it is, your best bet in the future is to avoid over-exposing shots where bright sunlight and dark subjects meet. Under exposed images can be corrected later in software and are less likely to have this problem. The best "treatment" for blooming is to use PhotoShop or some other similar product to desaturate only the areas where the color fringe occurs. You can do this by simply selecting the offending color and either changing it to the surrounding color or simply desaturating it. If the identical color appears elsewhere in the subject, for instance, you will need to mask off the area using the selection tools or a masking program and perform the desaturation only on the affected areas to avoid removing the same color in areas of the image which you don't wish to affect.

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Old Jul 10, 2002, 9:20 AM   #6
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Default For Lin Evans..

Hey, Lin!

I swear, I love reading your posts as much as I love looking at every single one of your posted excellent photos! They are always so informative.
Keep 'em coming!


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