Patent ID: 7639395

Claim:
An image-forming device comprising: a data conversion unit configured to convert, for each of a plurality of pixels in an image to be formed, original image data indicative of a multilevel density into dot data indicative of whether or not a dot is to be formed; an isolated-dot size determining unit that determines the size of an isolated dot according to a condition; and an image-forming unit configured to form an image on a recording medium by selectively forming a dot for each pixel based on the dot data, while forming the isolated dot with the determined size, a developer-accommodating unit configured to accommodate developer, the image-forming unit forming the image by using the developer accommodated in the developer-accommodating unit; and a consumption-detecting unit configured to detect the amount of developer consumed from the developer-accommodating unit, wherein the isolated-dot size determining unit is configured to determine the size of the isolated dot so that the size of the isolated dot that is determined when the amount of consumed developer reaches a reference amount is greater than the size of the isolated dot that is determined when the amount of consumed developer does not reach the reference amount.