When measuring the square pixel dimension, should the spread of the square due to chromatic aberration or geometric distortion be included in the measurement?
This measurement is an approximation used by the Lens Profile Creator to help correctly detect the grid, and does not have to be 100% accurate. Including or not including the spread from chromatic aberration should be fine, although measuring the smallest square should take into account squares that are smallest due to geometric distortion. These squares should be considered for measuring the smallest square. It’s also recommended that no square in the image have a dimension shorter than 20 pixels.
