An inkjet ink for improving printhead lifetimes includes: an aqueous-based ink vehicle; a colorant; an anti-kogation additive; and an anti-corrosion additive having at least one acetylenic group, the acetylenic group being absent any tertiary or quaternary -carbon atoms.

An image processing apparatus for correcting image data used to print an image on a print medium by discharging ink from a plurality of nozzles provided in a printhead in scanning in each of a first direction included in a scanning direction crossing a conveyance direction of the print medium and a second direction different from the first direction, comprising a correction unit configured to perform correction for, in the image data, image data to be printed by scanning in the first direction in accordance with a degree of condensing of the ink in the nozzles such that a density change caused by the condensing is relaxed, and perform, for image data to be printed by scanning in the second direction in the image data, correction different from the correction for the image data to be printed by the scanning in the first direction.