Reflection Manuscript Copy Point Analysis - News Photos

The news printed paper is web, the printing process is completed by tension, the paper shrinks sharply, the dot enlargement rate is high, the background color is serious, the structure is loose, the ink is strong, and the high-speed rotary press is used for printing. Easy to be missing, the color is reduced due to hair hanging hair, so the number of screen lines is less than 130 lines/in. All these characteristics should be fully considered in the reproduction of news photos, and appropriate compensation should be made during production.

(1) Bright and colorful: In order to reflect the propaganda effect of color newspapers, consider printing conditions are poor, should try to make the color pure and saturated, to prevent excessive color caused by overprinting and stringing color brought dirty. In Photoshop it is possible to increase the saturation and spot color correction to increase the base color and reduce the opposite color to achieve.

(2) Strong contrast: The maximum density of newsprint printing is only about 1.2. The highlight of the paper has a background color of the paper, and the deepest point is also light due to the relationship of high-speed rotary printing. When the operation can be properly compensated by the method of calibration, whitefield office can give up part of the high light level, taking into account the background color of paper. The darkest place in the dark field has to do with a variety of editions. After the four-color ink is overprinted, it will reach more than 300%. Sometimes it is possible to deepen the value of dark dots at the deepest point in order to use the full range of newsprint tone adjustments.

(3) Emphasis on sharpness: High-speed printing often causes halo, causing loss of detail. When you make sharpening masks, you have to be over-exaggerated, character drafts are weaker, and scenery and buildings are stronger.

(4) Under color removal: The use of background color removal can reduce the amount of color ink, facilitate the rapid overprint of the rotary machine, which helps to stabilize the neutral gray balance, making the layout look clean and bright. When using the GCR method for color separation using Photoshop, the total amount of ink is 280% to 300%, the black version uses a moderate amount, the maximum value is 80%, and the dot gain is 30%.

(5) Since various manuscripts are affected by factors such as time, transmission, and equipment, the aesthetics are very important to the operator, and the operator finally plays a role in the final production results. As a color picture, the overall color of the picture should be made to be undistorted and its color should be close to its true effect. For example, for a person's photo, the level of the person's face should be rich and delicate. The four-color value of the skin color is controlled at C: 0% to 10%, M: 10% to 40%, and Y: 10% to 40%. BK: Absolutely network. For landscape photographs, it should be ensured that the colors are crisp and clear, the sky is mainly literacy, and the magenta version is appropriate, otherwise the sky will become dark, giving people a sense of oppression. After the overall part is mastered, set the black and white fields of the picture, and the small area of ​​the extremely bright spot can be eliminated. However, large parts of the sky can not open the skylight, dark tone to retain part of the hierarchy. The field density of the film is more than 4 and the fog is less than 0.04; the error of the network at all levels is less than 2%. The tone range is 2% to 90%.

(6) Imagesetter output four-color film repeatability ≤ 0.05μm (four open version), requires an image-setter accuracy of about 1600dpi, minimum not less than 1200dpi.