values in similar manner by arbitrary values 4 to 4 by pushing the appropriate buttons in the corresponding one of the rows of buttons labelled 34 r 34 34 g 34 and 34 b 34 respectively the resulting classification defined by the luminance red green and blue print exposure values is recorded by the classifier 39 s magnetic head 930a in the appropriate one of the dedicated tracks in accordance with the track allocation defined in a read only memory such as the memory 240 of fig5 it should be noted that if data previously recorded on the film strip 100 indicates that it has been previously developed and printed so that a classification value is stored in each frame in the appropriate track then the developer 927 and the classifier 930 are automatically bypassed a printer 940 receives the film strip 100 reads the classification previously recorded in each frame by the classifier 930 and exposes one frame in a roll of photosensitive paper 937 through the corresponding negative frame with an exposure whose characteristics meet the recorded classification the printer 940 includes its own magnetic read write system such as a magnetic head 940a a controller 945 and a memory 950 storing a classifier printer algorithm this algorithm governs the magnetic reading and writing by the printer 940 and classifier 930 in accordance with the dedicated tracks format of fig1 or fig3 for example the printer classifier algorithm requires the controller 945 to determine whether camera tracks tracks c0 through c3 were previously recorded on the film strip.