Pioneer 10 was launched in March 1972 and flew through the Jovian system in December 1973. These are the best images of Europa taken by Pioneer 10.
This image of Europa has little color variation, but does show a broad dark region with some gross detail. The image resolution is 161 km/pixel and a phase angle of 87 degrees. The image on the left is a color composite. The image on the right is the same image enhanced by computer processing.