Scan black and white field settings

Some friends always feel that the contrast, lack of sharpness, and color cast may occur when the image is scanned, which may be caused by poorly set black and white fields in the scan. In general, the so-called “highlight point” should be: The brightest point in the image that begins to appear at the bright tone level, but it is not the “brightest point” that is the brightest part of the image. "Dark tone point" is generally the end point of the image tone level, but it is not the darkest point.

Coated paper printing requires bright spots that cannot be netted (ie, the four-color dots are all 0), so they are

Be careful when choosing areas of high light. The settings for the brightest four colors are: C5, M3, Y3, K0, or

Further bright: C4, M2, Y2, K0, if the original is too bright or too dark, the setting value can be changed.

However, it should be ensured that the values ​​scanned at the brightest points are basically the above-mentioned values ​​and no netting phenomenon can occur. Black House Design

It is important to note that the total amount of common offset inks is between 320 and 360. Too thin will result in unsaturation of printed images.

, color is not bright, and the dark part of the C version must be greater than the M version and Y version, and the K version can not be less than 80, otherwise

There will be color cast and dark tone graying, the general setting is: C90, M85, Y85, K80, if

The conditions of the printing factory are good, and the requirements for printing products are high, then it can be done: C95, M90, Y90, K85, such prints

Good contrast, rich levels.

The newspaper is printed on a rotary press, the speed is fast and the ink drying time is short, so the oil during the copying process

The ink should not be too thick, and the total dot area rate for four-color printing should be limited. At the same time, the ratio should be larger.

The gray component of the case is replaced. For the characteristics of newspapers, the smallest dot surface that can be completely transmitted to newsprint

The product rate is between 6% and 8%. When selecting a highlight, the image should begin to appear with a high level of highlights

The dot area area rate is not lower than this range, otherwise the high light dot transmission will be incomplete or completely lost, making the image

The leveled highlights turned into a white highlight. Dark spots cannot be like ordinary offset printing.

The total amount of ink can only reach 270-300, so it can be set as: C60-65, M50-55, Y50-55,

K90-95.

Reprinted from: China Print Information Network