| Inkjet printers are currently the most common type of printer in the society,and the number of cases related to inkjet printer files is increasing.At present,research on inkjet printed documents mostly focuses on the chemical composition and optical analysis of inks,but there are few studies on the graphic features of the documents.In order to find the change law,and provide some reference for the actual inspection and appraisal,this experiment mainly explores the influence of the related hardware and software changes on the graphic on the inkjet printing documents.The experiment is divided into two parts: the stability of inkjet printing features and the study of the influence of software and hardware on inkjet printing characteristics.Hardware and software include: ink cartridges,scanners,printers,computer systems,word processing software,text printing mode,drivers,scanned pictures of the save format.The test method is to compare and analyze the horizontal white line features,text morphology and ink dots distribution characteristics,dot morphological characteristics,lab values and density values in the printed samples.The results show that:First,inkjet printing feature stability experiment:(1)the stability of horizontal white line characteristics and dot morphological characteristics is poor,even if the same print command under the continuous printing of samples will also change.(2)The stability of Lab values and density values,text morphology and ink dots distribution characteristics is high.Second,the influence of hardware and software on the characteristics of inkjet printing in the experiment:(1)The changes in the details of the character form and dot distribution characteristics are different.Printers,scanners,drivers,word processing software,text printing mode can all affect the character form;the dot distribution characteristics were most affected.Neither changing cartridges nor Windows operating systems could affect the dot distributions of samples in the experiments.(2)Only the ink cartridges in the hardware and software of the experiment have no effect on the morphological characteristics of the dot.(3)Lab values and density values change due to changes in text printing mode,scanners,and printers.Therefore,in the identification,the difference of horizontal white line characteristics,character form and ink dot distribution characteristics cannot be used as the basis for negative conclusions separately;The dot morphological characteristics are not high in stability,and there are high similarity of different printers,so it cannot be used as the basis for inspection and identification;Lab value and density value are relatively stable,and it may be a relatively effective auxiliary means. |
