Correcting chromatic aberration is demonstrated in Figure 31. Distortion –field is for defining the parameters for correcting distortion. The menu of right hand side is for choosing the image file.

The menus on left hand side are for correcting purple fringing caused by chromatic aberration and darkening of the edges caused by vignetting. The operating system is presented in Figure 30. No matter how it is used, it only needs the profile information of the camera that the images have been taken with. It can be installed either besides Photoshop or as an individual program.

PTLens is software that corrects lens pincushion and barrel distortion, vignetting, chromatic aberration and perspective.

In photography for example, aberrations such as barrel and pincushion aberration can not be avoided when an image is taken with a wide angle or teleobjective. No matter how well the lens or the lens system is chosen, there might, however, be left errors that can only be corrected afterwards with specific software. Other option is to take action in the phase when to lens system is built and pay attention to the refraction indices of the components. optical, chemical, mechanical and thermal characteristics, processability and price) and lens design for the purpose.

That is done by exploiting their calibration information to choose the best suitable material (based on e.g. described before in Chapter 2.2., aberrations can often be corrected already before the lenses are manufactured.

Ptlens vs dxo viewpoint