Abstract: In an example, a method is described. The method includes receiving a color response profile associated with a first color calibration pattern printed on a first medium. The method further includes determining a drop weight ratio associated with the first medium based on a color response profile for the first medium and a color response profile associated with a reference color calibration pattern printed on a reference medium. The method further includes determining an anticipated color response profile associated with a second medium based on the drop weight ratio associated with the first medium and a pre-determined color response profile associated with the second medium.

Abstract: An example method of purging filler fluid from a printhead of a printing device includes applying a plurality of energy levels to a resistor coupled to the printhead. In addition, the method includes determining a temperature profile of a fluid within the printhead while applying the plurality of energy levels. Further, the method includes characterizing the fluid based on the temperature profile.

Abstract: The present disclosure relates to vinyl substrate printing. In an example, a vinyl printing apparatus is disclosed wherein the apparatus comprises a media path to convey a vinyl substrate along a feed direction from a substrate supply to a print zone; an inkjet printhead to print on the print substrate at the print zone; and a heater upstream of the print zone to heat the print substrate to evaporate a plasticizer from a surface of the print substrate.

Abstract: Disclosed herein is a method of calibrating a printing device, a detector for use in a printing device and a printing device. The method is for calibrating a printing device having a nozzle that is to eject a drop of a printing fluid and a sensor that is to detect a drop of the printing fluid at a detection position. The method comprises ejecting a drop of the printing fluid from the nozzle; determining a measurement signal during a detection window with the sensor; extracting an arrival time of the drop from the measurement signal; and determining an adjusted detection window by adjusting the detection window based on the arrival time.

Abstract: In an example, a machine-readable medium stores instructions which when executed by a processor cause the processor to determine a difference between a measured printed output and an expected printed output. Based on the difference, a first control instruction for controlling a drop size wherein the drop size is variable, and a second control instruction for controlling a dot density of a variable dot density may be determined.

Abstract: The present disclosure relates to vinyl substrate printing. In an example, a vinyl printing apparatus is disclosed wherein the apparatus comprises a media path to convey a vinyl substrate along a feed direction from a substrate supply to a print zone; an inkjet printhead to print on the print substrate at the print zone; and a heater upstream of the print zone to heat the print substrate to evaporate a plasticizer from a surface of the print substrate.

Abstract: An example method is disclosed of adjusting a print head parameter, the method comprising ejecting a print agent drop from a print head, determining a velocity of the print agent drop, and adjusting the print head parameter based on the velocity of the print agent drop wherein the print head parameter is a number of drops of print agent in an area and/or a density of print agent applied by the print head.

Abstract: An example appearance calibration system includes a profile engine that identifies a printer setting corresponding to a non-color appearance attribute of an image source and a setting engine that sets a printer setting corresponding to the non-color appearance attribute. An example set of instructions may cause a processor resource to identify a setting corresponding to a printer component that affects an appearance attribute and provide layer appearance information representing a degree of the appearance attribute identified using a look-up table. An example method of appearance matching among a plurality of printers is described. In the example method, a plurality of appearance attributes controllable between a first printer and a second printer is identified, a degree of each attribute compatible with the first and second printer is determined, and instructions are prepared for the first and second printer using the degree of each attribute compatible with the first and second printer.