To shorten the exposure time of a printing form.

A method for exposing a printing form includes providing a plurality of exposure channels 310 disposed in a two-dimensional array 38, and inputting energy, by the exposure channels of a column of the array, for an image element 20 moving relatively to the exposure channels. Further, a first row of the array of exposure channels is activated to produce a first component of the input of energy assigned to each column of the array in one row of image elements. A second row of the array of exposure channels 310 is activated to produce a second component of the input of energy assigned to each column of the array when a point 314 of projection of the exposure channel 310 of a second row of the array comes to lie on the image element of the row already exposed by the exposure channel 310 of the first row and the same column.