A method includes obtaining a measurement of a property of a light source,
scanning light from the light source onto a surface, such that the light
interacts with the surface, detecting light from the surface to create a
picture element, and correcting the picture element with the measurement
of the property. An apparatus includes a scanned beam display, the
scanned beam display is configured to receive a signal and to scan the
signal for viewing by a user. The signal is to contain picture element
information. The picture element information includes information for a
plurality of colors, wherein information for at least one color is
corrected to substantially remove a perturbation to the picture element
information, such that an image containing the picture element
information will be substantially unchanged by the perturbation.