Abstract: An example printing device includes: a paper path; a component controllable to cause reduction of moisture along the paper path; a sensor and a reflective surface on opposite sides of the paper path such that paper moves along the paper path between the sensor and the reflective surface, the sensor to: emit light towards the reflective surface; and detect light reflected from the reflective surface; and a processor connected to the sensor and a memory storing instructions, the processor to execute the instructions to cause the processor to: communicate with the sensor to determine that the light detected by the sensor, as reflected from the reflective surface, meets a moisture threshold condition; and in response to determining that the light detected by the sensor meets the moisture threshold condition, control the component to reduce the moisture along the paper path.

Abstract: Examples of curl compensation through selective ink usage are described. In an example, whether curling is likely to occur on a printed page may be determined. The page may be printed using a first ink lacking anti-curl properties and a second ink having anti-curl properties in response to determining that curling is likely to occur.

Abstract: Examples of curl compensation through selective ink depletion are described. In an example, whether printing in a region of a page is likely to produce curling of the page may be determined based on a page location and a print density of the region. The region of the page may be printed with a depleted amount of an ink in response to determining that printing the region at the page location with the print density is likely to produce curling of the page.