HOW TO CHECK A PRINTED PROOF

HOW TO CHECK A PRINTED PROOF

Before making the printing plates and proceed to run, it is interesting to judge the result of photocopying operations of a control test. This check test is very important as it will serve as the printer model. It is right to proceed with a preliminary examination of the test without worrying about the original. The image is sharp, the balance of satisfactory color, a pleasing contrast? This preliminary examination is done preferably in daylight. If some anomaly, of course, refers to the original. If the comparison is made with an image projected on a video we must not forget that 90% of the brightness and contrast are due to the effect luminance (light source), and inevitably disappear when printing on paper that receives only a light (surface illuminated by source). An example that highlights the precautions to be sure of the exact definition and the faithful reproduction of a color: an industrial or a trader wishing that a precise color characterizes its image. This color will be that of the symbol or logo to be reproduced on all conceivable media, writing paper, paper and cardboard packaging, different applications on glass, plastic, cellophane, signs, vehicles, brochures, magazines and periodicals, advertising films, etc. . These different media are printed with the different procedures. Starting from the sample received you will have: to define the ink formulations, carry out tests run in all print industrial processes: gravure, offset, type, screen printing, flexography, on a wide range of media; to realize both of the mat evidence that bright; examine each test under different light sources: the sun, tungsten, fluorescent, gray day; proceed spectrometric analysis of each formula obtained so as to fix the translation. From this it follows as the color terms are to be considered with caution.

(From: “Foto Formatura e Stampa Offset” by Pierre Durchon – Tecniche Nuove Editore).

[NOTE: This is an automatic translation]