An image forming system includes an image forming station for forming a transparent image on a recording material with transparent toner; a selecting portion for selecting one of image forming modes including a first image forming mode for forming a transparent image having a high glossiness and a second image forming mode for forming a transparent image having a glossiness lower than that in the first image forming mode; and a setting portion for setting a toner amount, per unit area, of the transparent image in accordance with the image forming mode selected by the selecting portion.