Beschreibung:
The speed and average gradient of a conventional screen‐film system was measured at four European laboratories. This is the first interlaboratory comparison in which the measurement conditions described in ISO 9236‐1 were applied. The four laboratories used calibrated measurement equipment. The values obtained by the four laboratories were within a range of 14% for the speed and within a range of 8% for the average gradient. These variations are consistent with the expected measurement uncertainty.