What is Purple Fringing at Digital Camera ?
Sometime if we capture image with digital camera, there are some aberration
at our picture, usually it is notice after transfer it to computer. Probably
it will not always show at the same location, it randomly strike. The aberration
is not always purple, it can stretch into magenta and other colours, but purple
is frequently reported. The issue is even more confusing since the severity
and colour tint will vary between camera models and conditions.
Purple fringing is also known as chromatic aberrations. Have you noticed bright
purple light along sharp edges in your pictures that were taken against bright
light? This is not evident when you look at the picture on the small LCD screen
of your camera. But when you download the image and see it at full resolution,
your first reaction is where did this purple light come from? This is nothing
but purple fringing or chromatic aberrations. This aberration can turn into
magenta or some other colour but purple is more common. There are many technical
reasons, and some disagreement, as to why purple fringing occurs in digital
cameras. These factors include the lens, focus, leakage between pixels, and
more. Most of the problems are a result of the camera's design and there is
little that can be done to change these factors. It is possible, however, to
understand the shooting conditions that are likely to cause problems. The most
common cause of purple fringing is low light with high-contrast boundary areas
in an image.
How to Avoid and Remove Purple Fringing ?
This is by experience. As I said the lighting conditions generally make a huge
difference and once you start shooting it would be intuitive. How to remove
purple fringing? Adobe Photoshop and most other graphics programs would let
you control the Hue and Saturation of the image. You can play with the settings
there (DONT change the master colors, but only touch the individual color settings).
Some imaging software also produce to solve this purple fringging problem.
The nature of purple fringing makes it amazingly easy to remove. Its colour
range is fairly narrow and, as mentioned above, in most cases it occurs at boundaries
between black and white. You could try using most of the built-in auto-adjust
and ‘fix photo’ features in your graphics program, but these tend
to make things worse.
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