A printing system for printing images formed of pixels on a substrate, the system comprising a print system arranged where print-heads traverse a substrate, the print system arranged to receive a sequence of print actuation requests in order to print each pixel of an image upon the substrate, the print system having an acceptable rate for the sequence of print actuation requests, the system configured whereby if presented with an actuation period of less than the minimum actuation period then the presented rate of print actuation requests is adjusted by altering the actuation event and/or the discarding of stripe data, to minimise print defects.

A printing system for printing images formed of pixels on a substrate, the system comprising a print system arranged where print-heads traverse a substrate, the print system arranged to receive a sequence of print actuation requests in order to print each pixel of an image upon the substrate, the print system having an acceptable rate for the sequence of print actuation requests, the system configured whereby if presented with an actuation period of less than the minimum actuation period then the presented rate of print actuation requests is adjusted by altering the actuation event and/or the discarding of stripe data, to minimise print defects.

A first image has a first superimposing portion being a rear end portion of the first image. A second image has a second superimposing portion being a front end portion of the second image. A filter processing unit performs filter processing on the first superimposing portion and the second superimposing portion. A panoramic image has a superimposing region. The filter processing is processing for reducing change in image quality of the superimposing region occurring in a situation where the second superimposing portion overlaps the first superimposing portion in a misaligned manner.

A first image has a first superimposing portion being a rear end portion of the first image. A second image has a second superimposing portion being a front end portion of the second image. A filter processing unit performs filter processing on the first superimposing portion and the second superimposing portion. A panoramic image has a superimposing region. The filter processing is processing for reducing change in image quality of the superimposing region occurring in a situation where the second superimposing portion overlaps the first superimposing portion in a misaligned manner.

In some examples, continuous frequency based print pipeline generation may include ascertaining an input image that is to be printed. For a specified pixel of the input image, a first frequency and a second frequency that respectively correspond to first and second colors may be determined. Based on the first frequency and the second frequency, an intermediate frequency that is to be generated to produce an intermediate color relative to the first and second colors may be determined. The intermediate frequency may be converted to discrete pulses. Operation of a printhead that is to print the specified pixel may be controlled based on the discrete pulses.

In some examples, continuous frequency based print pipeline generation may include ascertaining an input image that is to be printed. For a specified pixel of the input image, a first frequency and a second frequency that respectively correspond to first and second colors may be determined. Based on the first frequency and the second frequency, an intermediate frequency that is to be generated to produce an intermediate color relative to the first and second colors may be determined. The intermediate frequency may be converted to discrete pulses. Operation of a printhead that is to print the specified pixel may be controlled based on the discrete pulses.

The thermal printer includes a heating element, and a voltage supply circuit that supplies a drive voltage and a test voltage to the heating element. The voltage supply circuit includes a drive voltage supply circuit that is coupled to the heating element and that turns ON the supply of the drive voltage to the heating element, a test voltage supply circuit that is coupled to the heating element and that turns ON the supply of the test voltage to the heating element, a drive voltage stop circuit setting the supply of the drive voltage of the drive voltage supply circuit OFF, and a test voltage stop circuit setting the supply of the test voltage of the test voltage supply circuit OFF.

An integrated circuit includes thermal tracking logic, control logic, and an output interface. The thermal tracking logic determines a temperature of a fluid ejection die. The control logic defines an emulated parameter of the fluid ejection die as a function of the temperature of the fluid ejection die. The output interface outputs the emulated parameter to a printer system based on the function and the temperature of the fluid ejection die.

In some examples, dithering based color conversion may include ascertaining an input color value. Based on conversion of the input color value to an output color space representation, a set of nodes that are to be analyzed to control operation of a printer may be determined. Based on a position of the input color value from each node of the set of nodes, a corresponding probability associated with each node of the set of nodes may be determined. Further, the operation of the printer may be controlled based on the determined probability associated with each node of the set of nodes.

A thermal head control device includes: a printing rate calculation range determination unit configured to determine, as a printing rate calculation range, a range from a left-end energization dot to a right-end energization dot among energization dots present in printing data corresponding to heating elements to be controlled among a plurality of heating elements included in a thermal head; a printing rate calculation unit configured to calculate a printing rate of the printing rate calculation range determined by the printing rate calculation range determination unit; an energizing time calculation unit configured to calculate an energizing time for which a current is caused to flow through the heating elements based on the printing rate calculated by the printing rate calculation unit; and an output unit configured to output a control signal for driving the heating elements to be controlled of the thermal head, based on the calculated energizing time.