Image forming method and device

摘要

A synthesized image is formed by synthesizing a main image and a background mage represented by respective image data items each having n-valued gradation values each having any one of n possible values(n is an integer which is equal to or larger than 3) and defining a density of pixels. A plurality of different data items representative of candidates for the background image are stored as background image data candidates. An arbitrary one of the background image data candidates is set to a background image data item representative of the background image. There is formed a main image data item forming a main image data item representative of the main image, the main image data item having n-valued main image gradation values commonly applied to all valid pixels of the main image, as values of the n-value gradation values. An adjusted background image data item is formed by forming an adjusted background image data item by modifying the background image data item through replacing background gradation values applied to pixels of the background image as values of the n-valued gradation values by adjusted background gradation values formed by modifying the background gradation values. A synthesized image data item representative of the synthesized image is formed by synthesizing the main image and the background image based on the adjusted background image data item and the main image data item.