What is the color
Sometimes, the photo subject outline appears the red or blue halo (
skew ) , this halo of color or color cast is called chromatic aberration . That
part of the image is also like wearing stereoscopic glasses to see the effect,
it seems to be the image produced shaking. There are two color difference
occurs in the image and position of the edge of the chromatic aberration of
magnification chromatic aberration . Either , all of the light wavelength of
the three primary colors RGB differences exist (i.e. the color difference ) ,
when they pass through the lens caused by different refractive index .
Magnification chromatic aberration occurs when the size of the image because
different wavelengths will be different , and thus more close to the edges of
the image , the color halo phenomenon is more serious which is also known as
lateral chromatic aberration of magnification chromatic aberration , wide angle
lens generally prone to this color.
On the other hand , the position is due to chromatic aberration caused
by different wavelengths of the light image formed by the focus position shift
deviation , also known as longitudinal chromatic aberration . Focal length of
the lens , that is prone to such a telephoto lens color. Recently, however, in
order to reduce the color shift many manufacturers have adopted the ED lens ,
compared with the previous color has largely been suppressed.
For position color tightening aperture and how to get some suppressed ,
but including chromatic aberration of magnification included , color itself is
determined by its optical properties , in the design of the lens can not be
completely eliminated. But, like Nikon and Pentax K -7 cameras are set up on
the inside of the camera captured images chromatic aberration compensation. For
other models the photographs , you can also take advantage of post-processing
software or Photoshop and other image processing software to compensate for
chromatic aberration .
Usually in high contrast color part of the more obvious . This is an
instance of chromatic aberration of magnification . See the lower right portion
of the building generates a large aberration. And with Photoshop compensation,
it clears very clean. Here is an example of using Photoshop compensation , in
fact, most of the image processing software is equipped with red / cyan and
blue / yellow compensation.After all above,it's necessary to edit photos by photo retouching software.