Calibration of printing devices

1. A method for calibrating a printing device, the method comprising:

generating a calibration sheet of a calibrating medium having a length at least equal to the maximum printing width of a printbar of the printing device;

receiving the generated calibration sheet at a printing media inlet of the printing device to be calibrated such that a side of the generated calibration sheet having a length at least equal to a maximum printing width of the printbar is perpendicular to a media axis of the printing device, wherein the printbar comprises a plurality of modules, wherein each of the plurality of modules comprise a plurality of submodules, and each of the plurality of submodules prints a calibration pattern of a plurality of calibration patterns on the generated calibration sheet; and

printing a plurality of calibration patterns on the calibration sheet with the printing device to be calibrated; and

acquiring a calibration value for each one of the submodules of the printbar based at least in part on a calibration pattern printed by the submodule.

2. The method of claim 1 , comprising prompting a user to provide the generated calibration sheet to the printing media inlet.

3. The method of claim 1 , comprising prompting a user to provide the generated calibration sheet to the printing media inlet such that a side of the calibration sheet with a length at least equal to the maximum printing width is parallel to the printbar.

4. The method of claim 1 , wherein the printing device automatically rotates the sheet 90 degrees with respect to the media axis and automatically provides it to the printing media inlet.

5. The method of claim 1 , wherein the printbar comprises a plurality of modules, each module comprising a plurality of submodules, and wherein each one of the plurality of submodules prints a calibration pattern of the plurality of calibration patterns on the generated calibration sheet.

6. The method of claim 1 , wherein the printing device is a Page-Wide array printing device.

7. The method of claim 1 , comprising generating a calibration parameter for each one of the submodules of the printbar based at least in part on a calibration value.

8. A printing device comprising:

a printbar comprising a plurality of modules, and

a controller to:

instruct the printing device to generate a sheet of calibration medium of a length at least equal to a maximum printing width of the printbar;

instruct the printing device to automatically rotate the generated calibration sheet 90 degrees to be provided to a printing media inlet of the printing device to be calibrated such that a side of the sheet of calibration medium having a length at least equal to a maximum printing width of the printbar is parallel to a longitudinal axis of the printbar; and

instruct the printing device to execute a calibration procedure.

9. The printing device of claim 8 , wherein the controller is to:

generate a prompt to request feeding of the sheet to a printing media inlet of the printing device such that a side of the sheet of calibration medium having a length at least equal to a maximum printing width of the printbar is parallel to the printbar.

10. The printing device of claim 8 , wherein the printing device is a Page-Wide array (PWA) printing device.

11. The printing device of claim 8 , wherein each of the plurality of modules comprise a plurality of submodules, and wherein each one of the plurality of submodules prints a calibration pattern of the plurality of calibration patterns on the generated calibration sheet as part of the calibration procedure.

12. The printing device of claim 11 , wherein the controller receives a sensed calibration datum related to each one of a plurality of submodules of a printbar of the printing device based at least in part on a calibration pattern printed by the submodule.

13. The printing device of claim 12 , wherein the controller generates calibration parameters based at least in part on the sensed calibration data.

14. A non-transitory computer readable medium encoded with instructions which when executed by a processor, cause the processor to:

instruct a printing device to generate a sheet of a calibration medium having a length at least equal to a maximum printing width of the printbar of the printing device to be calibrated;

instruct the printing device to automatically rotate the generated calibration sheet 90 degrees to be provided to a printing media inlet of the printing device to be calibrated such that a side of the sheet of calibration medium having a length at least equal to a maximum printing width of the printbar is parallel to a longitudinal axis of the printbar; and

instruct the printing device to execute a calibration procedure on the generated sheet of calibration medium.