When compressing the contrast of the original tone, the following methods are often used to compress some parts.
â‘ Normally, normal manuscripts have proper contrast and should compress the low-key levels more flat, especially when it is necessary to emphasize the middle and light tone levels.
â‘¡The original is too dull, and the bright tone is flat. If the dark tone and the middle tone level are emphasized, the middle tone level will be flattened accordingly.
â‘¢The contrast of the original is too dull. The whole painting-face-low-key-face-product-large, the low-key level should be pulled away, but the middle-tone level appears flat.
â‘£ The middle tone level of the original is relatively flat, and the contrast is small. The bright tone level can be compressed to make the contrast of the middle tone level larger.
⑤ The contrast of the original is basically suitable for printing and copying. The photos are mainly in the middle tone. The dark tone-area-product-is small, and the dark tone level can be compressed to emphasize the middle tone level.
â‘¥ Color photos are often encountered. These manuscripts are thin and have low contrast. For these manuscripts, the bright and dark tone levels can be compressed to make the contrast of the middle tone levels larger.
⑦The level of the bright tone level of the original is low, and the contrast is small. You can pull the bright tone level, but the middle tone level is flat.
The contrast of the natural color positive film of the transmissive manuscript is relatively large, about 3.0. Normally, it is necessary to compress the contrast to meet the requirements of copying the printed matter; while the manuscript of the reflective manuscript has a small contrast and the manuscript is boring. Make a bright copy. For example, the main point of copying portraits is the skin color of the person, the two colors of y and m are the key points; the key point of copying the landscape picture is the natural scenery, and the two colors of y and c are the main points. Use the gradation travel button flexibly to adjust the reasonable gradation curve, correct the shortcomings of the original, keep the main part, and lose the secondary part accordingly, make bold choices, and try to achieve better results. However, if the adjustment of the gradation curve is unreasonable, it may cause the effect of the picture being reversed, the gradation is unclear, and the hue is inaccurate.
The color reproduction of printed matter mainly has the deficiency of basic colors. On the contrary, it has the disadvantage of excessive colors. To reproduce high-quality printed products, the basic colors should be deeper on the basis of not losing the level. The basic color should be 100%, the moderate basic color should be full, the light basic color should be appropriate, and the bright basic color cannot be lost.
The opposite color should be appropriate. Because the purity of the inks on the market is not bright enough, the hue and transparency are poor, and the whiteness and smoothness of the paper are poor, so when using the color, it is necessary to pay attention to the brighter complementary colors (opposite colors) to be smaller and denser. The complementary colors at the color should be used. The brightest small-surface-product color complementary colors can not be used, so they play the role of color change and set off the level. Properly applied can make the basic colors more vivid, thick and rich and realistic.
The color reproduction of the printed matter is actually an additive color reproduction of the three primary colors y, m, and c of the colorants, with the subtractive light as the primary color light. The three primary colors of y, m, and c are the basic primary colors of all colorful colors. The black-version--can't afford any color change, the black-version--is only to stabilize the gray balance, play a skeleton role in the color picture, make the dark tone darker, emphasize the low-key level and outline, enhance the picture The thickness and three-dimensional sense. The three primary colors of y, m, and c materials transition to the black field, that is, y + m + c = approximately black. A part of the background color (tri-primary color) of the neutral hair formed from the three primary colors of y, m and c is removed and replaced with black ink. This is the method of under-color removal (UCR) used by electrical extensions and Apple computers. There are many necessities for background color removal: â‘ improvement of printing suitability, generally used in dark tone areas, in dark tone areas, if printing with three primary colors, the dot-area-product- tend to be very high, when high-speed multi-color printing It is easy to cause problems such as over-thickness of ink layer and paste-version.
If the background color is removed, it will greatly reduce the amount of ink, mainly save the amount of y, m, c color ink, improve printing suitability. â‘¡Conducive to control the neutral gray balance.
The length of the tone of the black version is determined by the amount of background color removal of the three colors y, m, and c. The amount of background color removal is large. The midtone and dark tone levels are flat. The black version is suitable for pulling the tone. Make it longer to compensate for the missing layers of the three-color version. If the three-color-version-removal volume is small, the black-version-tone can be shortened appropriately to avoid dullness in the middle tone. Dark tone is generally calibrated with the maximum density of the image to satisfy the image tone. It is necessary to calibrate according to the characteristics of the original, pay attention to the color balance of the dark tone, and at the same time, the dark tone calibration also needs to consider the relationship with the under color removal (UCR).
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