Abstract: In an example, a surface inspection apparatus includes a light source to illuminate a portion of a surface in a print apparatus, a light detection apparatus and processing circuitry. The light detection apparatus may receive diffusely reflected light and specularly reflected light from the portion of the surface, and may comprise a detection element for detecting the specularly reflected light. The processing circuitry may comprise a comparison module to determine a relationship between an intensity of the detected diffusely reflected light and the detected specularly reflected light and a quality module to evaluate if the surface meets a quality criterion based on the relationship.

Abstract: A method is described in which wiping of a printhead of a printer is caused in accordance with a first wiping routine, the first wiping routine comprising periodic wiping events performed on the printhead; at least one printing parameter of a rate of an aggregation of printing liquid deposits is obtained; a second wiping routine is determined, the second wiping routine comprising periodic wiping events performed on the printhead, the wiping period of the second wiping routine being determined depending on the at least one printing parameter; and wiping of the printhead in accordance with the first and second wiping routines is caused.

Abstract: A print mode determination method is disclosed. The method comprises receiving image data defining parameters of pixels of an image to be printed using a print apparatus; identifying, based on the image data, a first fill area in the image that exceeds a defined threshold area, wherein the first fill area is to be printed in a first color; determining, based on the image data, a first proportion of print agent of each of a plurality of colors to be used to print the first color; and determining, based on the determined first proportions of print agent, a print mode to be used by the print apparatus to print the image. An apparatus and a machine-readable medium are also disclosed.

Abstract: Examples include a method for operating a printing device comprising a specific pen. The method comprises receiving future specific pen firing data related to a plurality of upcoming successive print jobs and collecting historical specific pen firing data. The method further comprises determining a level and timing of servicing of the specific pen in function of both of the received future specific pen firing data and of the collected historical specific pen firing data.

Abstract: A colorant value adjustment method is disclosed. The method comprises obtaining data defining colorant values for a plurality of print addressable locations representative of pixels of an image to be printed during a printing operation, wherein each colorant value is representative of an amount of colorant to be delivered from a print nozzle to a corresponding print addressable location as the print nozzle moves between the print addressable locations during the printing operation. The method comprises determining, based on the obtained data, a measure of time that the print nozzle is not to deposit colorant immediately prior reaching a first print addressable location. The method comprises determining, based on the determined measure of time, an adjustment to be applied to the colorant value at the first print addressable location. The method comprises applying the adjustment to the colorant value for the first print addressable location. An apparatus and a machine-readable medium are also disclosed.

Abstract: In an example, a surface inspection apparatus includes a light source to illuminate a portion of a surface in a print apparatus, a light detection apparatus and processing circuitry. The light detection apparatus may receive diffusely reflected light and specularly reflected light from the portion of the surface, and may comprise a detection element for detecting the specularly reflected light. The processing circuitry may comprise a comparison module to determine a relationship between an intensity of the detected diffusely reflected light and the detected specularly reflected light and a quality module to evaluate if the surface meets a quality criterion based on the relationship.