Colour failure correction: Colour failure can also be caused by incorrect film exposure. On assuming the negative is perfectly processed. The picture on the right has incorrect colour is caused by computer failure. Red majority colour can fool the computer to order a early through in of cyan cut off filter. Lost of colour balance caused the wooden back ground show blue in this sample picture. A pale colour face is very common trouble on printing people in a red colour environment, such as wearing a red dress, standing near a vast red colour object. Modern printer uses colour scanning technique can eliminate this trouble. This trouble can also be eliminated by manual colour compensation by adding more magenta colour.

Over exposure correction: The picture on the right is caused by extremely over exposure. This kind of trouble is very commonly found on disposable camera, which has no exposure adjustment, with high speed film taking pictures on a bright sunlight beach. Colour film is made up of at least three layers of emulsions. Under extremely over exposure. The bottom layer has absorbed much more light than normally required, causing colour balance offset. This kind of trouble is limitedly correctable by adding extra yellow exposure and reducing print density.

Under exposure correction: Under insufficiently light environment, the front layer of film has better advantage of exposing to light than the bottom layer. Therefore, a drift of colour balance can occur. Because of low density on the negative, the resulted print will have low contrast. This trouble is hardly correctable. Reduce print density could bring out some details on trade off with contrast as seen on the washed out picture on right side.

Flash too strong correction: Lots of camera in the market does not equipped with automatic flash control. On taking close up pictures, the flash is giving same full blast with no intolerance to faraway object. The print sample on right has the face white out by over exposure. Increase print density can correct the facial white out, with the price of darker background as shown on left. A proper way to correct this trouble is to print manually with dark room technique. Automatic machine is not suitable.

Tungsten light correction: Incandescent light has much lower colour temperature than sunlight. or electronic flash. Pictures taken near tungsten light will have yellow cast all over. It is very easily recognizable with a blue cast on the negative. Print colour can be slightly corrected by adding extra blue colour. If picture must be taken in incandescent ambient light. A conversion filter could be used with the price of reducing film speed. Advice customer to use tungsten light type film if possible. Most movie film are tungsten light type. It is not immediately available to consumers.

Florescent light correction: Pictures taken in shopping mall, gymnastic hall are usually have green cast. It is very easily observable with magenta rich colour on the negative. Add extra magenta colour to correct print colour. A conversion filter is also available for camera. It is always better to correct the colour on exposing the film rather than to correct them afterward.