BACKGROUND

Priming treatment may be applied to particular types of print media or substrates prior to the application of printing fluid or toner. This may be performed to improve adhesion of the printing fluid or toner to the print medium or substrate. This kind of treatment is usually performed by a page-wide roller at a stage when the print medium or substrate is fed from another roller, in order to apply the priming treatment uniformly and evenly. However, it is desired to selectively apply a priming treatment to the print medium or substrate.

