Abstract: A process for measuring a targeting of an electron beam that passes through a slot in a shadow mask in a multiple-beam color picture tube and strikes a phosphor stripe on a screen of the tube includes: exciting a luminous stripe in the phosphor stripe, recording an image of the luminous stripe with an image converter, determining outer edges of the phosphor stripe, generating an electron beam in the picture tube to illuminate a luminous spot on the phosphor stripe, recording an image of the luminous spot, determining positions of outer edges by analyzing the image of the luminous spot, and comparing locations of the outer edges of the phosphor stripe with the positions of the outer edges of the luminous spot to determine the targeting of the electron beam.