Illuminator calibrations for media edge detections

A method comprising:

• emitting light using an illuminator onto a media to be printed on;
• measuring reflected light from the illuminator using an optical sensor;
• generating reflectance data based on the reflected light measured by the optical sensor;
• determining a first brightness level while the illuminator is positioned over the media at which the illuminator emits light such that the reflected light is within a reflected brightness range corresponding to a high sensitivity range of the optical sensor;
• determining a second brightness level while the illuminator is positioned over an absorber at which the illuminator emits light such that the reflected brightness range is below a predetermined signal to noise ratio threshold;
• setting a brightness of the illuminator to the second brightness level in response to the second brightness level exceeding a brightness threshold;
• and
• proceeding with detection of an edge of the media using the second brightness level of the illuminator.

A non-transitory machine-readable storage medium encoded with instructions executable by a processor, the non-transitory machine-readable storage medium comprising:

• instructions to emit light on a media to be printed on using an illuminator;
• instructions to receive reflectance data from an optical sensor, wherein the reflectance data represents an amount of reflected light received at the optical sensor from the media;
• instructions to determine a first brightness level while the illuminator is positioned over the media at which the illuminator emits light such that the reflectance data is in a high sensitivity range;
• instructions to determine a second brightness level while the illuminator is positioned over an absorber at which the illuminator emits light such that the reflectance data is below a predetermined signal to noise ratio threshold;
• instructions to set a brightness of the illuminator to the second brightness level in response to the second brightness level exceeding a brightness threshold;
• and
• instructions to proceed with detection of an edge of the media using the second brightness level of the illuminator.