Adjusting print apparatus light sources

A light source uniformity correction method comprising:

• printing, using a print apparatus in which an array of light sources emit radiation onto a photoconductive surface to form a test image onto a printable substrate, the test image comprising a plurality of regions of print agent of a first colour;
• scanning, using a scanning device, the printable substrate to obtain a scanned image;
• processing the scanned image, using processing apparatus, to identify a non-uniformly printed region of the print agent of the first colour;
• determining, using processing apparatus, which light source of the array of light sources corresponds to the non-uniformly printed region;
• determining, based on the identified non-uniformly printed region, an adjustment to be made to a parameter of the corresponding light source;
• and
• adjusting the parameter of a light source in the array of light sources to improve print uniformity.

A print apparatus comprising:

• a print component comprising:
• a photoconductive surface;
• and
• a print head having a plurality of light sources, each light source to emit radiation onto the photoconductive surface to form an image to be printed with print agent onto a printable substrate during a printing operation;
• and
• processing apparatus to:
• receive a scanned image of a pattern printed by the print component onto a printable substrate, the pattern comprising a series of blocks of print agent;
• analyse the scanned image to identify a region of non-uniformity within the plurality of blocks of print agent;
• determine a light source of the plurality of light sources which is responsible for the region of non-uniformity;
• calculate, based on the identified region of non-uniformity, a power adjustment to be made to the light source to improve the uniformity;
• and
• adjust a power supplied to the determined light source according to the calculation.