Abstract: A pump for the transfer a predetermined total volume of fluid from a pump inlet to a pump outlet in a unit of time is calibrated by deriving a count of the number of times a volume of the fluid is transferred from a pump inlet to a pump outlet in a unit of time; and adjusting the number of times the volume is transferred in a unit of time until the derived count is substantially equal to a predetermined threshold value.

Abstract: An example device in accordance with an aspect of the present disclosure includes a first reservoir for a printable composition, a pump fluidically coupled to the first reservoir and a second reservoir, a sensor, and a controller. The controller is to identify first and second reservoir statuses based on the sensor.

Abstract: Systems and methods for replacing cells of an image based on some pre-determined metric are described herein. For example, systems and methods described herein may improve the functioning of a standard imaging system. For example, the systems and methods described herein may be used to post-process existing images in an imaging system based on one or more pre-determined metrics and improve the halftone images according to those pre-determined metrics.

Abstract: An example device in accordance with an aspect of the present disclosure includes a first reservoir for a printable composition, a pump fluidically coupled to the first reservoir and a second reservoir, and a valve to prevent backflow from the second reservoir to the pump. The valve is to selectively isolate the second reservoir from the pump based on a threshold pump pressure under which the valve is to close.

Abstract: Described herein are systems and methods for processing an image such as a halftone image. For example, in some embodiments, pixels of an image are checked to see if when printed would be represented by a given output. Pixels of the image that match defined values are replaced with pixels that are represented by a different set of outputs. This latter set of outputs may be selected to optimize one or more imaging attributes.

Abstract: The present disclosure relates to an inkjet printer 30 comprising a carriage unit to which a printhead (PT) is coupled, a primary ink tank (T1) and a secondary ink tank (T2) to store ink, and a controller (CT2) to control a pump (PM) so as to cause the secondary ink tank (T2) to supply the primary ink tank (T1) with ink.

Abstract: A processing apparatus is provided. The processing apparatus includes a controller to process information as part of a Halftone Area Neugebauer Separation printing process to use at least one opaque ink as a process colorant in combination with at least one further process colorant.

Abstract: In one example, a print job is received. The print job includes a first plot to be printed on a first side of a media, and a second plot to be printed on a second side of the media in registration with the first plot. The first plot and a fiducial mark are caused to print on the first side, the fiducial mark being a known distance from the first plot and including an identifier for the second plot. In response to detecting the identifier via a sensor and measuring a distance to the fiducial mark to discern a reference for printing the second plot, the second plot is caused to print on the second side in registration with the first plot.

Abstract: Scanner, method or computer program product, arranged to sense media color information, store predetermined color values of preselected non-printed media and storing corresponding color profiles adapted for the respective preselected media, and process sensed color values, compare a sensed color value with the predetermined color values, and select one of said color profiles based on the comparison.

Abstract: A source image is converted to a printable image that is constrained to a bi-directional gamut achievable by both a forward-first print mode and a reverse-first print mode. While the printable image is printed, a print system alternates between forward and reverse passes. The print system uses a forward-first color map during the forward passes and a different reverse-first color map during the reverse passes.

Abstract: In one embodiment, a print job is received. The print job includes a first plot to be printed on a first side of a media, and a second plot to be printed on a second side of the media in registration with the first plot. The first plot and a fiducial are caused to print on the first side, the fiducial being a known distance from the first plot and including an identifier for the second plot. In response to detecting the identifier via a sensor and measuring a distance to the fiducial to discern a reference for printing the second plot, the second plot is caused to print on the second side in registration with the first plot.

Abstract: Method of computing a convex hull in a predetermined color space, comprising determining a print attribute value range pertaining to a reference print attribute value, selecting base NP (Neugebauer Primary) area coverages, comprising area coverages of single NPs and combined NPs, having print attribute values in the print attribute value range, printing and measuring patches corresponding to the base NP area coverages, computing linear combinations of the base NP area coverages, and assigning one of the base NP area coverage or the linear combination of base NP area coverages to the corresponding color, depending on which is closest to the reference print attribute value.

Abstract: A method of printing using variable pixel replication factors involves generating from an input image a reference image and a plurality of half-tone source images generated at different resolutions of the input image and with post-halftoning pixel replication factors applied such that the half-tone source images are all the same size. A pixel-replication factor selector function is applied to each reference pixel of the reference image to determine a respective source image for that reference pixel. Thus, different reference pixels correspond to different pixel replication factors. A print-state image is assembled by applying to each print-state image pixel the print state of the corresponding source pixel in the corresponding source image. The print-state image is then printed to a print medium.

Abstract: The disclosure describes methods for color printing, performing a color separation process and performing a halftoning process. Furthermore, the disclosure describes the color separation process determining one or more Neugebauer Primaries, tessellating the Neugebauer Primaries, and generating one or more Neugebauer Primary area coverage vectors, whose area coverages are linear with respect to a device-independent color space. The disclosure further describes that the color separation process communicates with the halftoning process using one or more Neugebauer Primary area coverage vectors.

Abstract: Scanner, method or computer program product, arranged to sense media color information, store predetermined color values of preselected non-printed media and storing corresponding color profiles adapted for the respective preselected media, and process sensed color values, compare a sensed color value with the predetermined color values, and select one of said color profiles based on the comparison.

Abstract: A source image is converted to a printable image that is constrained to a bi-directional gamut achievable by both a forward-first print mode and a reverse-first print mode. While the printable image is printed, a print system alternates between forward and reverse passes. The print system uses a forward-first color map during the forward passes and a different reverse-first color map during the reverse passes.

Abstract: Method of computing a convex hull in a predetermined color space, comprising determining a print attribute value range pertaining to a reference print attribute value, selecting base NP (Neugebauer Primary) area coverages, comprising area coverages of single NPs and combined NPs, having print attribute values in the print attribute value range, printing and measuring patches corresponding to the base NP area coverages, computing linear combinations of the base NP area coverages, and assigning one of the base NP area coverage or the linear combination of base NP area coverages to the corresponding color, depending on which is closest to the reference print attribute value.

Abstract: A print control system adapted to control a digital printer having a first machine-readable ink of a first colour and a second ink that is not machine readable at the same wavelength as said first ink and that is of substantially the same colour, said system being adapted to control said printer to print upon a document in said first ink a position—determining pattern readable by a digital pen to enable said pen to acquire data to enable a position of said pen in said pattern to be determined, and to print human discernable content that is not read by said pen superposed with said pattern using said second ink and not said first ink.

Abstract: The disclosure describes methods for color printing, performing a color separation process and performing a halftoning process. Furthermore, the disclosure describes the color separation process determining one or more Neugebauer Primaries, tessellating the Neugebauer Primaries, and generating one or more Neugebauer Primary area coverage vectors, whose area coverages are linear with respect to a device-independent color space. The disclosure further describes that the color separation process communicates with the halftoning process using one or more Neugebauer Primary area coverage vectors.

Abstract: A color-separation LUT and/or algorithm method and apparatus preferably convert input device-color data to output device-colorants, for many color-presentation types—automatically and for arbitrary colorant-set. In one major aspect of the invention, a device-hue ring is defined along six straight edges of a cubical device-hue space (without segments ending at white and black). Preferably coordinates defined along the six segments parametrize the procedure and equipment, i. e. establish colorant indexing by those coordinates (and preferably device-hue). In a second major aspect, plural color transformations—having respective favorable and adverse characteristics—serve different portions of input color space; their outputs merge to combine favorable properties of the transforms. In a third, cusps of the colorant hue planes populate the output side of the hue ring. In a fourth, a colorant sampling technique (faster by several orders of magnitude than exhaustive sampling) canvasses the output space.