The most basic job of printing is to reproduce colors, and colors are often expressed through pictures. Image scanning is to convert the color information on the picture into digital signals that can be stored and edited by the scanning device, and then process these digital signals through application software such as image processing software and typesetting software. Therefore, whether the image can be copied accurately and with high quality, that is, as much as possible to retain the tone, gradation, contrast and saturation on the original document, is the basic standard to measure the image scanning quality. Printed manuscripts can be divided into reflective manuscripts and transmissive manuscripts. Among them, reflective manuscripts are divided into photos, prints, hand-painted manuscripts and printed manuscripts, etc .; transmissive manuscripts are divided into positive and negative manuscripts. Since each type of manuscript has different characteristics, the characteristics of each manuscript must be fully considered when scanning the calibration. Evaluation of image scanning quality: (1) Definite standards Accurate calibration of the manuscript is the basis of whether the manuscript can be truly restored, because it is related to the size of the contrast of the entire image and the loss of highlights and dark tones. For example, for a transmissive manuscript, if the contrast of the manuscript is normal, the white field should be selected at the density D: 0.35—0.50; if the manuscript is thin, and the amount of color needs to be emphasized, the white field should generally be selected at the density D: 0.20 -0.35; if the original is dull and needs to be made brighter, the white point should generally be selected at the density D: 0.60-0.80. (2) Complete tone and high definition The tone is the hierarchical structure of the whole picture. Complete tone can make the picture complete, because it is easy to lose the gradation in the darkest and brightest places, especially in the edge of the large area of ​​the screen composed of light white, this situation is more likely to occur. If tone is the body of image color reproduction, then the clarity of the image can be said to be the soul of image reproduction. Clarity can focus vision: whether an image is clear is the most important factor for its attention. (3) Faithful manuscript, higher than manuscript When the level of the original is rich, the contrast is strong, and the saturation is high, as long as the level, contrast, and saturation of the original can be restored as accurately as possible during scanning. And when the quality of the original is not very good, and even sometimes there is obvious color cast or low saturation, you should pay attention to adjustment when scanning to make the scanned image more real and bright than the original.
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