Common application methods and fault analysis of t

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Common application methods and fault analysis of scanners (V)

v. scanners are used in an alternative way to send "3D" scanning

1. Place the object to be scanned on the scanning platform and cover it with a piece of white paper. The purpose of covering the white paper is to make the scanning light source illuminate the side of the scanned object, which is the key to the implementation of "3 are British ICI (acquired by AkzoNobel), American DuPont, American Solvay, German BASF and hoechstd" scanning

2. Select the resolution required for scanning according to the needs. If it is a black-and-white picture submitted to the newspaper, select 150dpi and 256 gray-scale method to scan the gray-scale picture. For objects of general size, the picture scanned in this way can fully meet the printing requirements

3. Processing the scanned image is mainly to remove the scattering stripes in the background of the scanned image. The easiest tool to process pictures may be the "drawing" in the attachment of windows 95/98. After removing the scattered stripes in the background of the scanned picture with the circle tool and rubber tool in the drawing, and adding the text logo, the production is completed. Of course, if you need to store the image file in a format other than BMP, you can also reprocess it through image processing software such as Photoshop

simulation copier

. With the rapid decline in the price of printers and scanners, many friends invited them into their homes. If so, I'll teach you another trick to simulate the scanner as a "copier". This software is photocopier, which controls the scanner to scan the original, and then output it directly by the printer. If the quality of the original text is good, its "copy" effect is no less than an ordinary copier with tens of thousands of yuan

"photocopier" is an office sharing tool software written for windows 95/98/nt/2000 operating system platform. That's very simple. The latest version is 2.17, which can be downloaded through a link. The file size is 709kb

"after downloading and installing it, first prepare the scanner and printer, then place the documents to be copied on the scanner, and then start the photocopier to open its working window. The interface of photocopier after operation is shown in Figure 2. Its operation method is very similar to that of ordinary copiers. The work window is divided into six functional areas, and the top one is used to display the information in the work process. The top three buttons on the left are used to set the "copy" mode, where "copy in black and white" is black-and-white copy, "copy in grey scales" is grayscale copy, and "copy in color" is color copy. If you want to use a certain copy method, just click the corresponding button to make the Red Square appear on the left. For ordinary black-and-white text with only a few pictures inside, it is recommended to use the "copy in black and white" method. What it copies out is cleaner and the fastest. If you have a color printer and plan to copy color manuscripts, you can use the "copy in color" method. If you want to copy a color manuscript with slow color changes or large pictures, but you only have a black-and-white printer on hand, it is better to choose the "copy in grey scales" method

? Two buttons marked with 100% and 70% in the middle of the left are used to set the copy proportion. Click the "100%" button to copy without scaling according to the size of the original. At this time, the size of the printing paper used should be the same as that of the original. If the original is A4, the printing paper should also be A4. Click the "70%" button to reduce the original to 70% of the original size. You can choose the appropriate printing paper according to this proportion

? The scroll bar at the bottom of the left is used to set the brightness, which can be adjusted in seven grades from the darkest (left) to the whitest (right). Some scanners can automatically adjust the brightness, which is not needed

? The 11 keys on the right are used to set the number of copies and are displayed in two "LCD" numbers, at least 1 copy and at most 99 copies. If the number of copies is set incorrectly, just click the "C" key to clear the original setting result. It should be noted that if the number of copies exceeds 1, it is best to use the conveyor to automatically feed the paper, so that the original can be scanned once, and the number of copies you need can be "copied" continuously, otherwise the printing may be interrupted due to lack of paper

"when the above settings are ready, you can put the original into the scanner, power on the printer and scanner, load the printing paper, click the" copy "button in the figure to start copying, and soon the copy documents you need will be output from the printer

"computer darkroom"

"scan negatives into official photos, which is the function of professional dual platform scanners with a price of more than 5000 yuan. Ordinary scanners cannot scan transparencies. Now, I can tell you that as long as you make some changes to the ordinary scanner, the home desktop scanner can also scan the negatives in the busy market, but the image quality is slightly worse

"when scanning ordinary pictures, the light tube in the scanner will project light onto the surface of the picture, while during transparent scanning, the light source should project from the back of the film. What we need to change is to turn off the light tube inside the scanner, and then add a light source at the back of the film to be scanned. Among them, it is a very important step to turn off the light source inside the scanner. If possible, it is best to make a switch and put it on the chassis, so that it will not affect normal use. When scanning the negative film, open the top cover completely, put the negative film on the upper corner, press it with a thin piece of fine frosted glass (pay attention to handle it gently, so as not to grind the original mirror surface), use the pre scanning function to determine the scanning area of the negative film, cover the rest of the platform with black paper, and then turn on the desk lamp at home to illuminate the light directly above the frosted glass (the lamp tube is about 3 to 5 cm away from the glass, s). In fact, many high-end scanners are equipped with projection scanning adapters, and the principle of the device introduced in this method is the same. After scanning, use the "convert negative" function of image software such as Photoshop or photo studio 2.0 to convert the negative film into photos. Here we should pay attention to: select color or gray 600 DPI scanning, and ensure the stability of the light during the scanning process. After completion, adjust the contrast and chromaticity by referring to the negative film of the normal photo, and then convert it into a negative film. Finally, make appropriate adjustments, so that a photo can be "developed" without going to the photo studio. After experience, the effect of "developing" black-and-white or color negatives into black-and-white photos is generally not a problem, but you can't expect too much about it. If you want to develop color photos, you'd better go to the photo gallery (because the RGB positive and negative color conversion of color is complex, it's difficult to master it without practicing it for five or six months)

simple digital camera

? Both scanners and digital cameras obtain graphic and image information through the photoelectric device CCD, but in different forms. The photoelectric device of the scanner is strip-shaped, and the process of recognizing graphics is moving. The photoelectric device moves from one end of the graph to the other end to complete the scanning. The photoelectric device of digital camera is matrix, and its working process is instantaneous

 if you don't have a digital camera, only a scanner; And you need to take a picture and put it on the computer. Your approach must be to take photos first, then develop the photos, and then scan them after they are washed. After several twists and turns, such a photo is finally transmitted to the computer, but the effect is imaginable. We can completely transform the scanner into a native "digital camera"

 the scanner generally requires the scanned object to be planar, but the scanner using CCD has a certain depth of field and can scan the real object at a certain distance (previously introduced). In this way, we can imitate the principle of digital camera and add a convex lens on the scanner to make the scene image on the scanner platform. The specific method is to use a mechanical camera, remove the back cover, and put the ground glass slightly larger than the camera in the back, with the ground surface facing outward. It is best to leave the ground glass about a centimeter away from the camera to observe the focusing situation. Open the aperture to the maximum, and open the shutter speed to level B. press and hold the shutter while focusing and scanning. After the image is clear, you can complete the "shooting" work

source: Tianji

5. Please select the speed and confirm the load safety before running the mortar tensile testing machine, and then declare:

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