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’ 
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SUMMARY. 
Departing from the information storing in the negative in the case of ideal repro- 
duction, the discrepancies from the standard (ideal case) are treated, which originate 
from the individual elements within and beyond the camera when taking the picture. 
These discrepancies are of various character. Projective errors are those which can be 
eliminated exactly or sufficiently by appropriate definition of the elements of the inner 
orientation of the camera or by the projection in the plotting instrument. Non-projective 
errors (for instance distortion) may be symmetrical with respect to rotation or irregular 
(for instance deformation of emulsion). Discrepancies symmetrical with respect to rota- 
tion can be eliminated quite easily in plotting. It appears therefore to be useful to treat 
the correction elements used for this purpose as part of the storing and to observe the 
geometry of the picture after such a correction.