Apparatus for indicating overcorrections, in electrical color correction apparatus

DETAILED DESCRIPTION My copending application U.
S.
Ser.
No.
770,192, filed Feb.
18, 1977 entitled "Apparatus for Producing Corrected Color Chromatic Components", discloses apparatus which allows adjustment of color correction with a level indicator and automatic production of individual color extractions.
In that apparatus the color correction can be readily adjusted, however, with the large number of correction regulators in the color computer, it is possible that overcorrections or overcompensations can occur in various image areas.
For example, when the image signals exceed the signal range set by image black and image white.
Such defective setting cannot always immediately be recognized on the color viewing screen of the color correction monitor and in fact the monitor image must be carefully evaluated for a substantial length of time during which measurements are made.
The present invention has the primary object of improving color correction by means of a display which immediately indicates when various signal components exceed a first threshold or fall below a second threshold value.
Thus, the invention allows very simple color corrections with relatively inexperienced operators who need merely observe when the overthreshold light or underthreshold light for particular color component is illuminated.
Other objects, features and advantages of the invention will be readily apparent from the following description of certain preferred embodiments thereof taken in conjunction with the accompanying drawings although variations and modifications may be effected without departing from the spirit and scope of the novel concepts of the disclosure and in which: