Use Photoshop to make scanned images clearer

In the process of making electronic teaching plan, the scanner is an important equipment for us to get the picture of lesson plan. Generally, we always get high-quality image of the hope of a higher grade of the scanner, then, with a higher grade scanner will be able to obtain high-quality digital images? Not too! In order to obtain high-quality digital images, in addition to having excellent "weapons", we must also acquire the following "internal strength".

Selection of interpolation resolution

The so-called "interpolation resolution" refers to the scanner built through the interpolation compensation technology provided by the resolution, it is usually much higher than the optical resolution. But it does not improve the image quality, but several times even dozens of times times to increase the size of the image file, reducing the speed of the scan. Therefore, in the general use of the school, if not for the geographical teaching and teaching of high-quality map picture printing output, the choice of too high interpolation resolution is of little significance.

Post-processing of scanned images

Almost all scanners have varying degrees of problems in 4 aspects: 1, the overall contrast distortion, 2, image bias, 3, mesh (dot), 4, focal length is not allowed. Although many scanners can offset the impact of these disadvantages as much as possible by providing hardware or software to network and setting filters in the driver, the post-processing of scanned images is essential for optimal results.

First of all, using standard TWAIN interface to scan a true color picture, in order to adjust the overall contrast distortion, select "Image/Adjustment/color Level", in the pop-up window, adjust the left and right two small triangle position, and through the preview window to watch the effect of adjustment, until satisfied. Usually two small triangles to the middle of the move, so after several scans of different pictures, repeatedly adjusted, we can the scanner image of the overall contrast distortion degree of "quantification", that is, to determine the left and right two small triangles moving direction and amplitude. If the image color, you can select the "image/Adjustment/change", in the pop-up window to select the closest to the original picture of the effect chart. Similarly, after many experiments, also know the scanner's color degree.

Next is to remove the dot, the implementation of "Filter/noise/speckle", how much clearer the image of it! The last process is to make up for the scanner focal length error, the implementation of "filter/sharpening/USM sharpening", carefully adjust the window parameters, attention radius (RADIUS) value not to be too large, this can make the image clearer. After many experiments, the focal length error of the scanner is also well aware.

After the above processing, you will find the image more lifelike, more sophisticated! If you have trouble with this, you can use Photoshop "action" function, the above several processes to make an "action", the next need to deal with, just perform this "action" can be coherent!

OK, now your "ren du two veins" has been through, coupled with sophisticated "weapons", the image will be lifelike display in your electronic teaching plan!