Changing colours of the pixels in an image, including adjusting brightness, contrast, mid-level grays, hue and saturation, to achieve optimum printed results. It can also refer to the correction of colour in camera through the use of light balancing and colour correction filters or CC filter. In digital cameras this can include adjusting the white balance and other custom functions.
A colour corrected lens will bring most colours to the same focus and thus avoids loss of sharpness due to colour fringes in the image. Specially important in colour photography. The better the lens, the more perfect is usually the degree of colour correction.
The process of adjusting an image on the computer to achieve a desired result when printed, is a tricky business. Getting an exact colour match between a print and the original is very difficult, moreover it is quite often the case that a slavish reproduction of the original does not make for a good print. The skilled colour-retoucher will often work alongside the artist to create a print that is subtly different from the original with its own virtues and distinctive characteristics.
Modifying the colour balance of an image, usually to produce a more accurate representation of the colours in an image. Colour correction compensates for the deficiencies of process colour inks, inaccuracies in a scan or colour separation, or an undesired colour balance in the original image.