Abstract
Any color image editing software has Brightness, Contrast, and Saturation controls. However, because it usually imitates
corresponding adjusting knobs of a Color TV, and thus, corresponds to mid 20th century scope of engineering, adjusting
one of the parameters affects all three parameters, and modification of Brightness or Contrast does not preserve
chromatic coordinates. A person should be very experienced with the sequential control operations in order to get a
result equivalent to a simple expocorrection.
A set of new generation algorithms described in this paper is free from the above-mentioned defects and includes:
Brightness and Contrast editing which does not affect chromatic coordinates; Local Contrast editing that causes only
minor modification of Global Dynamic Range; Global Dynamic Range modification which affects neither chromatic
coordinates, nor Local Dynamic Range; and Saturation modification which affects neither Brightness, nor Hue.
The efficiency of color image editing software depends on the choice of a basic CCS (Color Coordinate System). A CCS
that is effective for one editing procedure might be less effective for another. This paper presents a set of correlated
CCSs with a specification of their preferable area of application.
