An image forming apparatus that includes an image bearing member which can bear a toner image, a transfer member used to transfer a toner image onto a recording material from the image bearing member, and a reading device which reads density information of images on recording material disposed on a platen. The image forming apparatus forms a first chart on a first recording material and a second chart on a second recording material by sequentially transferring a plurality of test images while applying a plurality of test voltages to the transfer member. The two charts are read by the reading device and the transfer voltage is adjusted based on the reading result.

An image forming apparatus that includes an image bearing member which can bear a toner image, a transfer member used to transfer a toner image onto a recording material from the image bearing member, and a reading device which reads density information of images on recording material disposed on the platen. The image forming apparatus forms a first chart on a first recording material and a second chart on a second recording material by sequentially transferring a plurality of test images while applying a plurality of test voltages to the transfer member. The two charts are read by the reading device and the transfer voltage is adjusted based on the reading result.

An image forming apparatus includes an image forming device that forms an image on a recording medium and circuitry that controls the image forming device. The image forming device forms an invisible image with an invisible material on the recording medium and forms a visible image with a visible material on the invisible image. Each of first and second adhesion amounts includes respective adhesion amounts of the visible material and the invisible material per unit area in a portion, in which the visible image is formed on the invisible image, of the composite image. The second adhesion amount is smaller than the first adhesion amount. The controller adjusts the amount of the invisible material included in the second adhesion amount to be smaller than that included in the first adhesion amount, to cause the image forming device to form the image according to the second adhesion amount.

An image forming apparatus includes an image forming device that forms an image on a recording medium and circuitry that controls the image forming device. The image forming device forms an invisible image with an invisible material on the recording medium and forms a visible image with a visible material on the invisible image. Each of first and second adhesion amounts includes respective adhesion amounts of the visible material and the invisible material per unit area in a portion, in which the visible image is formed on the invisible image, of the composite image. The second adhesion amount is smaller than the first adhesion amount. The controller adjusts the amount of the invisible material included in the second adhesion amount to be smaller than that included in the first adhesion amount, to cause the image forming device to form the image according to the second adhesion amount.

An image forming apparatus includes an image forming device that forms an image on a recording medium and circuitry that controls the image forming device. The image forming device forms an invisible image with an invisible material on the recording medium and forms a visible image with a visible material on the invisible image. Each of first and second adhesion amounts includes respective adhesion amounts of the visible material and the invisible material per unit area in a portion, in which the visible image is formed on the invisible image, of the composite image. The second adhesion amount is smaller than the first adhesion amount. The controller adjusts the amount of the invisible material included in the second adhesion amount to be smaller than that included in the first adhesion amount, to cause the image forming device to form the image according to the second adhesion amount.

When trial printing is executed in a repeat printing mode, trial printing is performed in size of an image of one piece in a layout in which a plurality of images are supposed to be printed in the repeat printing mode normally. A user who has checked a finished state of the trial printing sets, when the finished state is in a desired state, the recording paper on which the trial printing is performed to the paper feed portion again and executes the repeat printing. Thereby, in a blank space excluding a print image which is printed with a first time trial printing, a scheduled quantity of a plurality of images are repeatedly printed.

When trial printing is executed in a repeat printing mode, trial printing is performed in size of an image of one piece in a layout in which a plurality of images are supposed to be printed in the repeat printing mode normally. A user who has checked a finished state of the trial printing sets, when the finished state is in a desired state, the recording paper on which the trial printing is performed to the paper feed portion again and executes the repeat printing. Thereby, in a blank space excluding a print image which is printed with a first time trial printing, a scheduled quantity of a plurality of images are repeatedly printed.

An image forming apparatus includes: an image forming unit that transfers a toner image onto a recording medium, the toner image being formed on an image carrier by an electrophotographic system; and one or more processors that control an operation of the image forming unit, and that are configured to: perform multiple operations under different conditions about charging and exposure to light in predetermined order, the operations including at least an operation of forming a toner image on the recording medium with the image carrier having been subjected to charging and exposure to light and an operation of forming a toner image on the recording medium with the image carrier having been subjected to no exposure to light and optionally to charging; and control the image forming unit to form margins of different forms, the margins being formed on pieces of the recording medium in the respective operations performed under the different conditions.

When trial printing is executed in a repeat printing mode, trial printing is performed in size of an image of one piece in a layout in which a plurality of images are supposed to be printed in the repeat printing mode normally. A user who has checked a finished state of the trial printing sets, when the finished state is in a desired state, the recording paper on which the trial printing is performed to the paper feed portion again and executes the repeat printing. Thereby, in a blank space excluding a print image which is printed with a first time trial printing, a scheduled quantity of a plurality of images are repeatedly printed.

An image forming apparatus includes an image forming device that forms an image on a recording medium and circuitry that controls the image forming device. The image forming device forms an invisible image with an invisible material on the recording medium and forms a visible image with a visible material on the invisible image. Each of first and second adhesion amounts includes respective adhesion amounts of the visible material and the invisible material per unit area in a portion, in which the visible image is formed on the invisible image, of the composite image. The second adhesion amount is smaller than the first adhesion amount. The controller adjusts the amount of the invisible material included in the second adhesion amount to be smaller than that included in the first adhesion amount, to cause the image forming device to form the image according to the second adhesion amount.