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Image scan quality evaluation:
(1) accurate calibration
Accurate calibration of the original document is the basis for the true restoration of the original, because it is related to the size of the entire image contrast and how much loss of highlights, dark tone and other issues. For example, for a transmitted original, if the contrast of the original is normal, the white field should be selected at a density of D: 0.35-0.50; if the original is thin, the amount of color needs to be increased, and the white field should generally be selected at a density of D: 0.20. - 0.35; If the original is more boring, need to be brighter, white field should generally choose the density D: 0.60-0.80. (2) Complete adjustment and high resolution
Tonality is the hierarchical structure of the entire picture. A complete tone can make the picture complete, because it is easy to lose the level in the darkest place and the brightest place, especially in the edge area of â€‹â€‹a large area composed of pale white, this situation is more likely to occur. If the tone is the body of image color reproduction, then the clarity of the image can be said to be the soul of image reproduction. Sharpness can focus on vision: whether an image is clear is the most important factor in whether it can attract attention.
(3) faithful manuscripts, higher than manuscripts
When the manuscript has a rich gradation, strong contrast, and high saturation, it is sufficient to restore the gradation, contrast, and saturation of the original as accurately as possible during scanning. When the quality of the original is not very good, and sometimes there is even a clear cast color or low saturation, attention should be paid to the adjustment during scanning, so that the scanned image is more real and bright than the original.
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