Multilevel density compensation for digital printing machines

The invention relates to a method correcting color density unevenness during a printing operation on an inkjet printing machine having printing nozzles and a computer. The computer modifies the numberor size (0, S, M, L) of the ink drops to be applied to a printing substrate to attain nominal color density values after the processing of a rasterized print image. The method is characterized in that: for different actual tone values, it is determined which target tone value is required to attain a nominal coloration by measuring a test image for every printing nozzle using a color measurement device, and, based thereon, an area coverage-dependent compensation profile is determined and saved on the computer to be applied in the printing operation to calculate the number and size (0, S, M, L) of the ink drops on the computer. 本发明涉及种用于在喷墨印刷机中在印刷进程期间对颜色密度方面的不均性进行校正的方法，所述喷墨印刷机具有印刷喷嘴和计算机，其中，所述计算机在处理加网的印刷图像之后为了实现额定颜色密度值改变待施加至承印材料上的墨滴的数量或尺寸(0、S、M、L)。本发明的特征在于，通过使用颜色测量仪器在不同的实际色调值的情况下为每个印刷喷嘴测出测试样本求取到为实现额定着色所需的目标色调值，和由此求取到