1. A digital camera having an image sensor ( 102 ) for producing analog image signals, having an analog/digital converter ( 103 ) for converting the image signals into digital raw data, and having a signal processing device ( 104 ) for producing processed data from the raw data, wherein the signal processing device ( 104 ) has a signal output; wherein the camera has at least one first buffer memory ( 106 ) for buffering at least some of the digital raw data and an evaluation device ( 108 ) which is made to compare raw data stored in the first buffer memory ( 106 ) with the processed data.