Documents Prior To Export To Note Three Points
1, scan color separation Scanner Calibration principle is to adjust the scanner can be faithfully copied into the manuscript’s tone-level information, color changes, and gray balance. The specific method is to use specific emission or transmission color, adjust scanning software high light, the dark tone of the gamma value and the median value. Necessary, adjust channel RGB or CMYK values, so that Electronic Tone images, color and gray balance and color consistency.
Follow these steps: 1. Scanner stability more than 10 minutes after boot, the standard color placed on the scanning area, start the scanning software, scan using the default parameters.
2. Scan is complete, in Photoshop, with the probe measuring the color gray wedge data. Necessary, adjust the scanning software high light values, dark tone, to make the first level of gray wedge 250 to 255 and the darkened section 22 in the 0 to 5. If the value after scanning the darkened large enough black shows darkened. Can be darkened value increases from 0 to larger values, guarantee the first 22 par value and 5, or even smaller. Of course, the white field calibration is the same. In between 19 to 22, numerical less the same, roughly about 10 and did not pull the dark level adjustment, the loss of tone is compressed. This is a performance by the scanner itself, the decision on the most original little effect. For the shadows of the original level of rich, suggested drum scanner.
3. Adjust halftone gamma value, so that the first 11-foot ladder gray values in the 125 or so. Article 11 If the value is low, can increase the gamma value; If not, reduce the gamma value.
4. Under the stairs at every level of gray scale RGB values the relationship between the size, adjust the three single values, so that each wedge in the three channels of roughly equal value. In case R = G = 125, B = 119, we can increase the B-channel gamma value, so that no partial yellow.
Scanned RGB images to CMYK color separation and subject only after the output. During this period, but also for color separation of image correction.
2, graphics, image processing and Workgroup Edition
1. Separations parameter settings This includes Print Ink set and color separation settings.
(1) printing ink set the use of a coated paper printing, ink optional TOYO INKS or SWOPINKS. Other parameters can be determined according to the specific paper to.
dot gain (dotgain) Department means the halftone dot 50% expansion of the situation. If printed on coated paper, it is recommended to take 12% ~ 15%; if the offset printing paper, with 15% to 20%; if the news paper printing, compared with 20% to 25%. The larger the value is set too, after the CMYK color separation data smaller.
gray balance refers to the time of printing ink gray balance values. The value of each printing press has.
grayscale images using dot gain. The point, grayscale images will change the dot gain compensation. The larger the dot, indicating the more dark. Options will also affect other models to convert to grayscale mode conversion data. For example, conversion from RGB gray level, the selected, the software will automatically call the dot gain compensation value of grayscale values. The larger the dot, the smaller the gray image data.
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