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Limits Are Exceeded whether a plot has exceeded the action limits or generally should be left alone. If a red, green, or blue measurement exceeds the action or control limits, verify the readings, check the process, and results confirm those of the first strip, proceed as condition is correct. When the out-of-control condition is verified by a second control strip, it must be considered real. Two consecutive control strips seldom provide similar false information about a process. important. These conditions in the process indicate unnecessary bias or drift away from the mean. For example, when successive plots of control values show that an increasing number of densities are you must take corrective action to stop or reverse the trend before plots have moved beyond the control limit. Also, processing conditions that cause control values to plot consistently within but near a control limit are acceptable. visual references of how they appear on a control chart. Diagnostic charts are also provided to give possible causes that can affect the process and what action to take in each instance. Each specific monitoring manual includes verbal descriptions of problems and lists possible solutions. they are quite complex. Physical quality, however, is equally important. It is good practice to monitor physical quality along with image quality by a methodical examination of control strips and finished work. The appearance of scratches, digs, spots, or streaks indicates a mechanical malfunction somewhere in the processing cycle (fig. 2-19). In many cases, the causes of these defects are self-evident, and often a bypass test can isolate the malfunction. Advanced Photography Course |
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