Correcting the position of print

A method of correcting the position of an image of content of one or more labels printed on a printable medium, the image being generated by a computer and printed on the printable medium by a printer controlled by the computer, in which:

• (i) the computer executes a print operation to print the image onto the printable medium;
• (ii) the computer obtains co-ordinates which define a required position of the image relative to the printable medium and displays a representation of the printable medium and of the image in their required relative positions;
• (iii) the computer responds to inputs from a user to determine co-ordinates of an actual position of the image printed on the printable medium in (i);
• and
• (iv) the computer computes and responds to the difference between the actual and the required positions to correct the position of the image when the image is generated by the computer in the next execution of a print operation such that the image will be printed at the correct position, wherein in (iii) the user views the representation and the image printed on the printable medium and operates an electronic input device communicating with the computer to cause the computer to alter the position of the image relative to the printable medium on the representation, such as to agree with the user's perception of the actual position of the printed image on the printable medium.