Method of and apparatus for generating image data used to record an image having gradation.

摘要

Gradation levels of an image to be recorded are expressed by gradation data having integral parts and decimal parts. Random numbers are composed with the decimal parts to provide composite values. When the composite value exceeds "1", the quantity "1" is added to the value of the integral part. The decimal parts are accumulated along the direction of an array of pixels, to provide accumulated values. Also when the accumulated value exceeds "1", the quantity "1" is added to the value of the integral part to provide a modified integral part. The modified integral parts are employed as gradation data in image recording.