Printing background print agents

A printer comprising:

• an interface to receive print data indicative of an image to be printed on a substrate, the print data indicating an image portion in which an image is present and a void portion in which the image is absent;
• a print agent module to determine an amount of background print agent to be applied to a region of the substrate corresponding to locations of the image portion and the void portion on the substrate when the image is printed;
• and
• a print head comprising at least one reservoir of print agent to apply the determined amount of background print agent to the substrate,
• wherein the print agent module is to determine an amount of background print agent to be applied by the print head to a region of the substrate corresponding to the location of the void portion on the substrate when the image is printed which is greater than the amount of a background print agent to be applied to the location of the image portion of the substrate when the image is printed.

A non-transitory machine readable medium comprising instructions which, when executed by a processor, cause the processor to:

• receive print data indicative of an image to be printed on a substrate, the print data indicating an image portion in which an image is present and a void portion in which the image is absent;
• and
• determine an amount of background print agent to be applied to a region of the substrate corresponding to locations of both the image portion and the void portion on the substrate when the image is printed;
• wherein the amount of background print agent determined to be applied to a region of the substrate corresponding to the location of the void portion when the image is printed on the substrate is greater than the amount of a background print agent to be applied to the location of the image portion when the image is printed on the substrate.