Image forming apparatus, output device, computer-readable medium and recording medium

1. An image forming apparatus for forming an image on a recording medium comprising:

a first image-forming material that contains a colored pigment and a second image-forming material that contains the colored pigment having a concentration lower than that of the first image-forming material;

a first image forming unit that forms a code image representing encoded information on the recording medium using the second image-forming material;

a second image forming unit that forms a first non-code image at a position other than the position of the code image on the recording medium using an image-forming material other than the second image-forming material; and

a third image-forming material in which the optical absorptance corresponding to that of the colored pigment is not greater than that of the second image-forming material;

a determination section that determines an area in which the code image and a second non-code image overlap; and

a third image forming unit that forms the second non-code image in only the area determined by the determination section on the recording medium using the third image-forming material.

2. The image forming apparatus according to claim 1 , wherein the image-forming material other than the second image-forming material contains the first image-forming material.

3. The image forming apparatus according to claim 2 , wherein the colored pigment of the first image-forming material is black.

4. The image forming apparatus according to claim 1 , wherein the colored pigment of the first image-forming material is black.

5. The image forming apparatus according to claim 1 , wherein the third image-forming material is selected from yellow, cyan, and magenta image-forming materials.

6. The image forming apparatus according to claim 1 , wherein

the first image forming unit includes a first image forming controller;

the second image forming unit includes a second image forming controller; and

the third image forming unit includes a third image forming controller.

7. An output device for forming an image on a recording medium comprising:

a control unit that generates first data and second data, the first data instructing that a code image out of image data, the image data including the code image representing encoded information and a first non-code image, should be formed on the recording medium using a second image-forming material, the second data instructing that the non-code image out of the image data should be formed at a position other than the position of the code image on the recording medium using an image-forming material other than the second image-forming material; and

a communication unit that transmits the first data and the second data to an image forming apparatus having a first image-forming material that contains a colored pigment and the second image-forming material that contains the colored pigment having a concentration lower than that of the first image-forming material, the image forming apparatus further including

a first image forming unit that forms the code image;

a second image forming unit that forms the first non-code image;

a third image-forming material in which the optical absorptance corresponding to that of the colored pigment is not greater than that of the second image-forming material;

a determination section that determines an area in which the code image and a second non-code image overlap; and

a third image forming unit that forms the second non-code image in only the area determined by the determination section on the recording medium using the third image-forming material.

8. The output device according to claim 7 , wherein the first data includes code image data and the second data includes non-code image data.

9. A non-transitory computer-readable medium for forming an image on a recording medium storing a program allowing a computer to function as an output device,

the output device comprising:

a control unit that generates first data and second data, the first data instructing that a code image out of image data, the image data including the code image representing encoded information and a first non-code image, should be formed on the recording medium using a second image-forming material, the second data instructing that the non-code image out of the image data should be formed at a position other than the position of the code image on the recording medium using an image-forming material other than the second image-forming material; and

a communication unit that transmits the first data and the second data to an image forming apparatus having a first image-forming material that contains a colored pigment and the second image-forming material that contains the colored pigment having a concentration lower than that of the first image-forming material, the image forming apparatus further including

a first image forming unit that forms the code image;

a second image forming unit that forms the first non-code image;

a third image-forming material in which the optical absorptance corresponding to that of the colored pigment is not greater than that of the second image-forming material;

a determination section that determines an area in which the code image and a second non-code image overlap; and

a third image forming unit that forms the second non-code image in only the area determined by the determination section on the recording medium using the third image-forming material.