Printing techniques are divided into classic and digital techniques. The most commonly used offset printing is classified under classic and electrophotography under digital techniques. These two techniques are prevalent in terms of application.
The theoretical part of the diploma thesis describes both printing techniques, their printing forms and the printing process. The experimental work describes how the test form is created in Adobe InDesign and what it contains. The measurements taken with a spectrodensitometer are added, which were divided into three parts, namely: measurements of the optical density of the colour, measurements of raster tonal values and measurements of L*a*b* values. Measurements are also shown graphically for different techniques and different types of paper. The experimental part was designed to print the same test form on 170 and 80g coated paper and on 170 and 80g uncoated paper. After the measurements, image cut-outs of various printing errors are shown, and image cut-outs which are used for comparison in visual analysis.
The purpose of comparing these four different prints is to confirm through measurements which printing technique is closest to the standardized values on which type of paper. The main goal of the thesis was to show the differences between printed materials printed with offset printing and electrophotography on coated and uncoated paper. The results showed that the paper coating has a great influence, as the measured values were always higher for uncoated paper. The visual analysis also showed possible errors and what quality can be achieved with each printing technique. Considering the above findings, we can more easily choose the printing technique for certain printed materials. With this, we can more easily achieve optimal values that are as close as possible to the standard ones.
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