JPS6440356A - Thermosensitive transfer gradation control device - Google Patents

Abstract

PURPOSE:To enable sufficient correction of the quality of an image deteriorated by heat accumulation of a line thermal head with ease by creating correction data sequentially using recording data of a preceding line and data for correction of a line before the preceding line. CONSTITUTION:A data storage device 10 sends density data to a density data correction circuit 13 in accordance with the first address, and the density correction circuit 13 transmits density data based on corrected density in compliance with density data to a density data comparison circuit 14. At that time, a data counter 15 has a count set to, for instance, '1', and reference density data which sequentially increases in response to the count is supplied to the density data comparison circuit 14 from the data counter 15. A contrast data comparison circuit 14 compares density data with the reference density data '1' which indicates the lowest color development density. When the density data is equal to the reference density data '1' or larger than the latter, the contrast data comparison circuit sends control data '1' to a shift register 16. When the density data is smaller than the reference density data the contrast data comparison circuit transmits control data '0' to the shift register 16.