How to scan the washed graduation photo into the computer?

It is absolutely impossible to retake with a digital camera. First of all, of course, it is still the digital age. Second, you need to remake the black paste with a digital camera.

You won't scan it, will you? You can scan for others or do it in PhotoShop. I don't believe in evil. I can enlarge 18 inch by scanning, and the effect is almost the same as your 12 inch photo.

Mind you: scan photos with a scanner. Don't think that this job is just to put photos on the scanner and execute scanning commands, because the scanned photos may have many defects. Master some skills.

Choose photos with "better" quality.

Good scanning setting skills and image processing software can hardly make the scanned photos better than the original ones. First of all, the clarity and cleanliness of photos are different, and the scanning effect will be very different. If the image of the photo is clear and natural, the scanned image will give people a comfortable feeling. If the definition of the photo is too low, the details of the scanned image will be blurred, giving people the feeling of inaccurate focus.

In developing and enlarging photos, the scanning effect of enlarging photos with glossy paper is better than that with cotton wool paper. The tiny particles on the surface of the tissue paper will scatter and lose part of the reflected light, which will eventually lead to the loss of picture information, especially in the dark part of the picture, which will cause a lot of layering and detail loss. On a common scanner, the particles on the lint paper will obviously appear in the scanning results.

Choose an efficient scanner

Choosing a scanner with ICE technology can solve the problem of creases and stains after photo scanning. ICE is an advanced image processing technology that combines hardware and software intelligence.

The scanner using digital ICE technology will scan three color channels, R, G and B, and add a scanning channel, namely D channel. This scanner can automatically detect dust, stains and creases on the image surface through photoelectric technology, and record these information in the D channel, and then repair various defects in the image when synthesizing the image. The RGB images converted by Digital ICE technology completely restore the true colors, not only restore the photos well, but also do not reduce the image quality at all, which can greatly improve the work efficiency of users.

Set the appropriate resolution.

The effect of high-resolution scanning of photos is often counterproductive, because while improving the scan resolution, some particles that are hard to be seen by the naked eye and the damage on the photo surface will be scanned in, and the scanned effect will naturally not be good, especially after magnification. The main performance is that there are many "noises" and the edges are rough, and the graininess of the photos can be clearly felt in smooth places. Therefore, one-sided pursuit of high resolution during scanning is not worth the loss.

Generally speaking, to scan a 3-inch ×5-inch photo, you just want to see it on the screen, and you can scan it with 100dpi. If you plan to print the scanned photos into 4-inch ×6-inch photos, you should scan the photos with a resolution of 300 dpi to 500 dpi. If you want to develop an 8-inch×10-inch photo, you should scan it with a resolution of 600 dpi ~ 1000 dpi.

Determination of black and white field

Black and white field refers to the darkest and brightest parts of pixels in a picture. In order to determine the black and white field, it is necessary to display as large a brightness range as possible in the picture. It can also be said that the whitest part of the picture makes its output reach the whitest data, usually 255, and the darkest part reaches 0. Professional scanning software can automatically search and mark the black-and-white field on the pre-scanned picture, so as to determine how to determine the black-and-white field, and let you consider whether to correct the color of the black-and-white field (such as software ColorQuatet).

The black-and-white field is first determined according to the positions where the brightest and darkest points appear. If the brightest spot appears at the reflection of eyes and metal objects, it can be pulled to 255. If the darkest point appears in a small local area of a picture, it is not necessary to show the hierarchy, and it can also be pulled to 0.

Adjustment of local hue

Although the determination of black and white field can make the overall visual effect of the photo black and white, only the information at both ends is concerned, and the middle tone part, that is, the focus of the image, also needs to be adjusted. The simple way is to adjust the gamma value, which can adjust the brightness effect of the middle tone of the image and make the visual experience better. A more complicated but better method is to use curve adjustment, which is similar to curve adjustment in Photoshop.

Important factors affecting the quality of scanner work

1, aperture: the concept of aperture also exists in scanners, but it is covered by some indicators. There are still lenses in the scanner, so there are naturally good and bad points. For example, there are optical glass lenses, resin lenses, coated lenses and filmless lenses. Naturally, these lenses also

There is an aperture. If there is an opportunity, you can take apart various scanners and compare different lenses. You will find that the lenses configured on professional scanners are all optical glass coated lenses. Although the aperture of the lens is relatively large, the aperture of the central transparent part is relatively small, which means that the aperture is very small.

Small; On the other hand, in ordinary scanners, most lenses are resin lenses, and the aperture of the lens is very small, but the aperture of the light-transmitting part is very large, and some of them are much larger than those in professional scanners, which belongs to the fully open state. The purpose of doing this is only to pursue more.

The scanning speed is fast, but the reality is that its clarity will be greatly affected.

2. Geometric accuracy: this is an index that is not marked on the scanner, but its influence on the scanning results can not be ignored. For example, if you scan a ruler, the result you see on the computer screen should be the same as the actual ruler, but due to the distortion of the cheap lens,

The cumulative error between the accuracy of stepping motor and the manufacturing accuracy of scanner transmission mechanism leads to the fact that the geometric accuracy of actual scanning is far from the theoretical accuracy of marking. Interested friends may wish to give it a try. At present, only professional scanners can do this to some extent.

Guarantee, this is especially important when used to scan remote sensing and aerial photography films, which is related to the final positioning aerial survey accuracy.

3, heat dissipation: this technology is not available in every scanner, only in some professional scanners. This is an effective measure to suppress the signal noise caused by the heat generated by CCD when it works, just like the refrigeration measures adopted on the back of digital cameras.

4. Shockproof: In order to effectively reduce the impact of the vibration generated during scanning on the scanning results, professional scanners generally use the counterweight method, just like a camera with a heavy tripod. While adopting this method, some manufacturers also learn from the technology in the car and equip the scanner with a 3D suspension system to further absorb the vibration generated during scanning, thus ensuring that the scanner can have high quality of work.

5. Color space: Just as each digital camera and each film can capture different color ranges, so can scanners. The higher the professional level of the scanner, the wider the color range that can be displayed and the more delicate the image will be described.

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